[pypy-commit] pypy numpy-speed: merge default

bdkearns noreply at buildbot.pypy.org
Fri Apr 18 04:50:29 CEST 2014


Author: Brian Kearns <bdkearns at gmail.com>
Branch: numpy-speed
Changeset: r70744:892ea7009bdf
Date: 2014-04-17 21:47 -0400
http://bitbucket.org/pypy/pypy/changeset/892ea7009bdf/

Log:	merge default

diff --git a/pypy/doc/whatsnew-head.rst b/pypy/doc/whatsnew-head.rst
--- a/pypy/doc/whatsnew-head.rst
+++ b/pypy/doc/whatsnew-head.rst
@@ -139,3 +139,4 @@
 Fix issues with reimporting builtin modules
 
 .. branch: numpypy-nditer
+Implement the core of nditer, without many of the fancy flags (external_loop, buffered)
diff --git a/pypy/module/micronumpy/__init__.py b/pypy/module/micronumpy/__init__.py
--- a/pypy/module/micronumpy/__init__.py
+++ b/pypy/module/micronumpy/__init__.py
@@ -23,6 +23,7 @@
 
         'set_string_function': 'appbridge.set_string_function',
         'typeinfo': 'descriptor.get_dtype_cache(space).w_typeinfo',
+        'nditer': 'nditer.nditer',
     }
     for c in ['MAXDIMS', 'CLIP', 'WRAP', 'RAISE']:
         interpleveldefs[c] = 'space.wrap(constants.%s)' % c
diff --git a/pypy/module/micronumpy/iterators.py b/pypy/module/micronumpy/iterators.py
--- a/pypy/module/micronumpy/iterators.py
+++ b/pypy/module/micronumpy/iterators.py
@@ -42,6 +42,7 @@
 """
 from rpython.rlib import jit
 from pypy.module.micronumpy import support
+from pypy.module.micronumpy.strides import calc_strides
 from pypy.module.micronumpy.base import W_NDimArray
 
 
@@ -156,6 +157,38 @@
         self.array.setitem(state.offset, elem)
 
 
+class SliceIterator(ArrayIter):
+    def __init__(self, arr, strides, backstrides, shape, order="C",
+                    backward=False, dtype=None):
+        if dtype is None:
+            dtype = arr.implementation.dtype
+        self.dtype = dtype
+        self.arr = arr
+        if backward:
+            self.slicesize = shape[0]
+            self.gap = [support.product(shape[1:]) * dtype.elsize]
+            strides = strides[1:]
+            backstrides = backstrides[1:]
+            shape = shape[1:]
+            strides.reverse()
+            backstrides.reverse()
+            shape.reverse()
+            size = support.product(shape)
+        else:
+            shape = [support.product(shape)]
+            strides, backstrides = calc_strides(shape, dtype, order)
+            size = 1
+            self.slicesize = support.product(shape)
+            self.gap = strides
+        ArrayIter.__init__(self, arr.implementation, size, shape, strides, backstrides)
+
+    def getslice(self):
+        from pypy.module.micronumpy.concrete import SliceArray
+        return SliceArray(self.offset, self.gap, self.backstrides,
+                          [self.slicesize], self.arr.implementation,
+                          self.arr, self.dtype)
+
+
 def AxisIter(array, shape, axis, cumulative):
     strides = array.get_strides()
     backstrides = array.get_backstrides()
diff --git a/pypy/module/micronumpy/nditer.py b/pypy/module/micronumpy/nditer.py
new file mode 100644
--- /dev/null
+++ b/pypy/module/micronumpy/nditer.py
@@ -0,0 +1,619 @@
+from pypy.interpreter.baseobjspace import W_Root
+from pypy.interpreter.typedef import TypeDef, GetSetProperty
+from pypy.interpreter.gateway import interp2app, unwrap_spec, WrappedDefault
+from pypy.interpreter.error import OperationError, oefmt
+from pypy.module.micronumpy import ufuncs, support
+from pypy.module.micronumpy.base import W_NDimArray, convert_to_array
+from pypy.module.micronumpy.concrete import SliceArray
+from pypy.module.micronumpy.descriptor import decode_w_dtype
+from pypy.module.micronumpy.iterators import ArrayIter, SliceIterator
+from pypy.module.micronumpy.strides import (calculate_broadcast_strides,
+                                            shape_agreement, shape_agreement_multiple)
+
+
+class AbstractIterator(object):
+    def done(self):
+        raise NotImplementedError("Abstract Class")
+
+    def next(self):
+        raise NotImplementedError("Abstract Class")
+
+    def getitem(self, space, array):
+        raise NotImplementedError("Abstract Class")
+
+
+class IteratorMixin(object):
+    _mixin_ = True
+
+    def __init__(self, it, op_flags):
+        self.it = it
+        self.op_flags = op_flags
+
+    def done(self):
+        return self.it.done()
+
+    def next(self):
+        self.it.next()
+
+    def getitem(self, space, array):
+        return self.op_flags.get_it_item[self.index](space, array, self.it)
+
+    def setitem(self, space, array, val):
+        xxx
+
+
+class BoxIterator(IteratorMixin, AbstractIterator):
+    index = 0
+
+
+class ExternalLoopIterator(IteratorMixin, AbstractIterator):
+    index = 1
+
+
+def parse_op_arg(space, name, w_op_flags, n, parse_one_arg):
+    ret = []
+    if space.is_w(w_op_flags, space.w_None):
+        for i in range(n):
+            ret.append(OpFlag())
+    elif not space.isinstance_w(w_op_flags, space.w_tuple) and not \
+            space.isinstance_w(w_op_flags, space.w_list):
+        raise oefmt(space.w_ValueError,
+                    '%s must be a tuple or array of per-op flag-tuples',
+                    name)
+    else:
+        w_lst = space.listview(w_op_flags)
+        if space.isinstance_w(w_lst[0], space.w_tuple) or \
+           space.isinstance_w(w_lst[0], space.w_list):
+            if len(w_lst) != n:
+                raise oefmt(space.w_ValueError,
+                            '%s must be a tuple or array of per-op flag-tuples',
+                            name)
+            for item in w_lst:
+                ret.append(parse_one_arg(space, space.listview(item)))
+        else:
+            op_flag = parse_one_arg(space, w_lst)
+            for i in range(n):
+                ret.append(op_flag)
+    return ret
+
+
+class OpFlag(object):
+    def __init__(self):
+        self.rw = 'r'
+        self.broadcast = True
+        self.force_contig = False
+        self.force_align = False
+        self.native_byte_order = False
+        self.tmp_copy = ''
+        self.allocate = False
+        self.get_it_item = (get_readonly_item, get_readonly_slice)
+
+
+def get_readonly_item(space, array, it):
+    return space.wrap(it.getitem())
+
+
+def get_readwrite_item(space, array, it):
+    #create a single-value view (since scalars are not views)
+    res = SliceArray(it.array.start + it.offset, [0], [0], [1], it.array, array)
+    #it.dtype.setitem(res, 0, it.getitem())
+    return W_NDimArray(res)
+
+
+def get_readonly_slice(space, array, it):
+    return W_NDimArray(it.getslice().readonly())
+
+
+def get_readwrite_slice(space, array, it):
+    return W_NDimArray(it.getslice())
+
+
+def parse_op_flag(space, lst):
+    op_flag = OpFlag()
+    for w_item in lst:
+        item = space.str_w(w_item)
+        if item == 'readonly':
+            op_flag.rw = 'r'
+        elif item == 'readwrite':
+            op_flag.rw = 'rw'
+        elif item == 'writeonly':
+            op_flag.rw = 'w'
+        elif item == 'no_broadcast':
+            op_flag.broadcast = False
+        elif item == 'contig':
+            op_flag.force_contig = True
+        elif item == 'aligned':
+            op_flag.force_align = True
+        elif item == 'nbo':
+            op_flag.native_byte_order = True
+        elif item == 'copy':
+            op_flag.tmp_copy = 'r'
+        elif item == 'updateifcopy':
+            op_flag.tmp_copy = 'rw'
+        elif item == 'allocate':
+            op_flag.allocate = True
+        elif item == 'no_subtype':
+            raise OperationError(space.w_NotImplementedError, space.wrap(
+                '"no_subtype" op_flag not implemented yet'))
+        elif item == 'arraymask':
+            raise OperationError(space.w_NotImplementedError, space.wrap(
+                '"arraymask" op_flag not implemented yet'))
+        elif item == 'writemask':
+            raise OperationError(space.w_NotImplementedError, space.wrap(
+                '"writemask" op_flag not implemented yet'))
+        else:
+            raise OperationError(space.w_ValueError, space.wrap(
+                'op_flags must be a tuple or array of per-op flag-tuples'))
+        if op_flag.rw == 'r':
+            op_flag.get_it_item = (get_readonly_item, get_readonly_slice)
+        elif op_flag.rw == 'rw':
+            op_flag.get_it_item = (get_readwrite_item, get_readwrite_slice)
+        elif op_flag.rw == 'w':
+            # XXX Extra logic needed to make sure writeonly
+            op_flag.get_it_item = (get_readwrite_item, get_readwrite_slice)
+    return op_flag
+
+
+def parse_func_flags(space, nditer, w_flags):
+    if space.is_w(w_flags, space.w_None):
+        return
+    elif not space.isinstance_w(w_flags, space.w_tuple) and not \
+            space.isinstance_w(w_flags, space.w_list):
+        raise OperationError(space.w_ValueError, space.wrap(
+            'Iter global flags must be a list or tuple of strings'))
+    lst = space.listview(w_flags)
+    for w_item in lst:
+        if not space.isinstance_w(w_item, space.w_str) and not \
+                space.isinstance_w(w_item, space.w_unicode):
+            typename = space.type(w_item).getname(space)
+            raise oefmt(space.w_TypeError,
+                        'expected string or Unicode object, %s found',
+                        typename)
+        item = space.str_w(w_item)
+        if item == 'external_loop':
+            raise OperationError(space.w_NotImplementedError, space.wrap(
+                'nditer external_loop not implemented yet'))
+            nditer.external_loop = True
+        elif item == 'buffered':
+            raise OperationError(space.w_NotImplementedError, space.wrap(
+                'nditer buffered not implemented yet'))
+            # For numpy compatability
+            nditer.buffered = True
+        elif item == 'c_index':
+            nditer.tracked_index = 'C'
+        elif item == 'f_index':
+            nditer.tracked_index = 'F'
+        elif item == 'multi_index':
+            nditer.tracked_index = 'multi'
+        elif item == 'common_dtype':
+            nditer.common_dtype = True
+        elif item == 'delay_bufalloc':
+            nditer.delay_bufalloc = True
+        elif item == 'grow_inner':
+            nditer.grow_inner = True
+        elif item == 'ranged':
+            nditer.ranged = True
+        elif item == 'refs_ok':
+            nditer.refs_ok = True
+        elif item == 'reduce_ok':
+            raise OperationError(space.w_NotImplementedError, space.wrap(
+                'nditer reduce_ok not implemented yet'))
+            nditer.reduce_ok = True
+        elif item == 'zerosize_ok':
+            nditer.zerosize_ok = True
+        else:
+            raise oefmt(space.w_ValueError,
+                        'Unexpected iterator global flag "%s"',
+                        item)
+    if nditer.tracked_index and nditer.external_loop:
+        raise OperationError(space.w_ValueError, space.wrap(
+            'Iterator flag EXTERNAL_LOOP cannot be used if an index or '
+            'multi-index is being tracked'))
+
+
+def is_backward(imp, order):
+    if order == 'K' or (order == 'C' and imp.order == 'C'):
+        return False
+    elif order == 'F' and imp.order == 'C':
+        return True
+    else:
+        raise NotImplementedError('not implemented yet')
+
+
+def get_iter(space, order, arr, shape, dtype):
+    imp = arr.implementation
+    backward = is_backward(imp, order)
+    if arr.is_scalar():
+        return ArrayIter(imp, 1, [], [], [])
+    if (imp.strides[0] < imp.strides[-1] and not backward) or \
+       (imp.strides[0] > imp.strides[-1] and backward):
+        # flip the strides. Is this always true for multidimension?
+        strides = imp.strides[:]
+        backstrides = imp.backstrides[:]
+        shape = imp.shape[:]
+        strides.reverse()
+        backstrides.reverse()
+        shape.reverse()
+    else:
+        strides = imp.strides
+        backstrides = imp.backstrides
+    r = calculate_broadcast_strides(strides, backstrides, imp.shape,
+                                    shape, backward)
+    return ArrayIter(imp, imp.get_size(), shape, r[0], r[1])
+
+
+def get_external_loop_iter(space, order, arr, shape):
+    imp = arr.implementation
+    backward = is_backward(imp, order)
+    return SliceIterator(arr, imp.strides, imp.backstrides, shape, order=order, backward=backward)
+
+
+def convert_to_array_or_none(space, w_elem):
+    '''
+    None will be passed through, all others will be converted
+    '''
+    if space.is_none(w_elem):
+        return None
+    return convert_to_array(space, w_elem)
+
+
+class IndexIterator(object):
+    def __init__(self, shape, backward=False):
+        self.shape = shape
+        self.index = [0] * len(shape)
+        self.backward = backward
+
+    def next(self):
+        # TODO It's probably possible to refactor all the "next" method from each iterator
+        for i in range(len(self.shape) - 1, -1, -1):
+            if self.index[i] < self.shape[i] - 1:
+                self.index[i] += 1
+                break
+            else:
+                self.index[i] = 0
+
+    def getvalue(self):
+        if not self.backward:
+            ret = self.index[-1]
+            for i in range(len(self.shape) - 2, -1, -1):
+                ret += self.index[i] * self.shape[i - 1]
+        else:
+            ret = self.index[0]
+            for i in range(1, len(self.shape)):
+                ret += self.index[i] * self.shape[i - 1]
+        return ret
+
+
+class W_NDIter(W_Root):
+    def __init__(self, space, w_seq, w_flags, w_op_flags, w_op_dtypes, w_casting,
+                 w_op_axes, w_itershape, w_buffersize, order):
+        self.order = order
+        self.external_loop = False
+        self.buffered = False
+        self.tracked_index = ''
+        self.common_dtype = False
+        self.delay_bufalloc = False
+        self.grow_inner = False
+        self.ranged = False
+        self.refs_ok = False
+        self.reduce_ok = False
+        self.zerosize_ok = False
+        self.index_iter = None
+        self.done = False
+        self.first_next = True
+        self.op_axes = []
+        # convert w_seq operands to a list of W_NDimArray
+        if space.isinstance_w(w_seq, space.w_tuple) or \
+           space.isinstance_w(w_seq, space.w_list):
+            w_seq_as_list = space.listview(w_seq)
+            self.seq = [convert_to_array_or_none(space, w_elem) for w_elem in w_seq_as_list]
+        else:
+            self.seq = [convert_to_array(space, w_seq)]
+
+        parse_func_flags(space, self, w_flags)
+        self.op_flags = parse_op_arg(space, 'op_flags', w_op_flags,
+                                     len(self.seq), parse_op_flag)
+        # handle w_op_axes
+        if not space.is_none(w_op_axes):
+            self.set_op_axes(space, w_op_axes)
+
+        # handle w_op_dtypes part 1: creating self.dtypes list from input
+        if not space.is_none(w_op_dtypes):
+            w_seq_as_list = space.listview(w_op_dtypes)
+            self.dtypes = [decode_w_dtype(space, w_elem) for w_elem in w_seq_as_list]
+            if len(self.dtypes) != len(self.seq):
+                raise OperationError(space.w_ValueError, space.wrap(
+                    "op_dtypes must be a tuple/list matching the number of ops"))
+        else:
+            self.dtypes = []
+
+        # handle None or writable operands, calculate my shape
+        self.iters = []
+        outargs = [i for i in range(len(self.seq))
+                   if self.seq[i] is None or self.op_flags[i].rw == 'w']
+        if len(outargs) > 0:
+            out_shape = shape_agreement_multiple(space, [self.seq[i] for i in outargs])
+        else:
+            out_shape = None
+        self.shape = iter_shape = shape_agreement_multiple(space, self.seq,
+                                                           shape=out_shape)
+        if len(outargs) > 0:
+            # Make None operands writeonly and flagged for allocation
+            if len(self.dtypes) > 0:
+                out_dtype = self.dtypes[outargs[0]]
+            else:
+                out_dtype = None
+                for i in range(len(self.seq)):
+                    if self.seq[i] is None:
+                        self.op_flags[i].get_it_item = (get_readwrite_item,
+                                                        get_readwrite_slice)
+                        self.op_flags[i].allocate = True
+                        continue
+                    if self.op_flags[i].rw == 'w':
+                        continue
+                    out_dtype = ufuncs.find_binop_result_dtype(
+                        space, self.seq[i].get_dtype(), out_dtype)
+            for i in outargs:
+                if self.seq[i] is None:
+                    # XXX can we postpone allocation to later?
+                    self.seq[i] = W_NDimArray.from_shape(space, iter_shape, out_dtype)
+                else:
+                    if not self.op_flags[i].broadcast:
+                        # Raises if ooutput cannot be broadcast
+                        shape_agreement(space, iter_shape, self.seq[i], False)
+
+        if self.tracked_index != "":
+            if self.order == "K":
+                self.order = self.seq[0].implementation.order
+            if self.tracked_index == "multi":
+                backward = False
+            else:
+                backward = self.order != self.tracked_index
+            self.index_iter = IndexIterator(iter_shape, backward=backward)
+
+        # handle w_op_dtypes part 2: copy where needed if possible
+        if len(self.dtypes) > 0:
+            for i in range(len(self.seq)):
+                selfd = self.dtypes[i]
+                seq_d = self.seq[i].get_dtype()
+                if not selfd:
+                    self.dtypes[i] = seq_d
+                elif selfd != seq_d:
+                    if not 'r' in self.op_flags[i].tmp_copy:
+                        raise OperationError(space.w_TypeError, space.wrap(
+                            "Iterator operand required copying or buffering for operand %d" % i))
+                    impl = self.seq[i].implementation
+                    new_impl = impl.astype(space, selfd)
+                    self.seq[i] = W_NDimArray(new_impl)
+        else:
+            #copy them from seq
+            self.dtypes = [s.get_dtype() for s in self.seq]
+
+        # create an iterator for each operand
+        if self.external_loop:
+            for i in range(len(self.seq)):
+                self.iters.append(ExternalLoopIterator(
+                    get_external_loop_iter(
+                        space, self.order, self.seq[i], iter_shape),
+                    self.op_flags[i]))
+        else:
+            for i in range(len(self.seq)):
+                self.iters.append(BoxIterator(
+                    get_iter(
+                        space, self.order, self.seq[i], iter_shape, self.dtypes[i]),
+                    self.op_flags[i]))
+
+    def set_op_axes(self, space, w_op_axes):
+        if space.len_w(w_op_axes) != len(self.seq):
+            raise OperationError(space.w_ValueError, space.wrap("op_axes must be a tuple/list matching the number of ops"))
+        op_axes = space.listview(w_op_axes)
+        l = -1
+        for w_axis in op_axes:
+            if not space.is_none(w_axis):
+                axis_len = space.len_w(w_axis)
+                if l == -1:
+                    l = axis_len
+                elif axis_len != l:
+                    raise OperationError(space.w_ValueError, space.wrap("Each entry of op_axes must have the same size"))
+                self.op_axes.append([space.int_w(x) if not space.is_none(x) else -1 for x in space.listview(w_axis)])
+        if l == -1:
+            raise OperationError(space.w_ValueError, space.wrap("If op_axes is provided, at least one list of axes must be contained within it"))
+        raise Exception('xxx TODO')
+        # Check that values make sense:
+        # - in bounds for each operand
+        # ValueError: Iterator input op_axes[0][3] (==3) is not a valid axis of op[0], which has 2 dimensions
+        # - no repeat axis
+        # ValueError: The 'op_axes' provided to the iterator constructor for operand 1 contained duplicate value 0
+
+    def descr_iter(self, space):
+        return space.wrap(self)
+
+    def descr_getitem(self, space, w_idx):
+        idx = space.int_w(w_idx)
+        try:
+            ret = space.wrap(self.iters[idx].getitem(space, self.seq[idx]))
+        except IndexError:
+            raise OperationError(space.w_IndexError, space.wrap("Iterator operand index %d is out of bounds" % idx))
+        return ret
+
+    def descr_setitem(self, space, w_idx, w_value):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    def descr_len(self, space):
+        space.wrap(len(self.iters))
+
+    def descr_next(self, space):
+        for it in self.iters:
+            if not it.done():
+                break
+        else:
+            self.done = True
+            raise OperationError(space.w_StopIteration, space.w_None)
+        res = []
+        if self.index_iter:
+            if not self.first_next:
+                self.index_iter.next()
+            else:
+                self.first_next = False
+        for i in range(len(self.iters)):
+            res.append(self.iters[i].getitem(space, self.seq[i]))
+            self.iters[i].next()
+        if len(res) < 2:
+            return res[0]
+        return space.newtuple(res)
+
+    def iternext(self):
+        if self.index_iter:
+            self.index_iter.next()
+        for i in range(len(self.iters)):
+            self.iters[i].next()
+        for it in self.iters:
+            if not it.done():
+                break
+        else:
+            self.done = True
+            return self.done
+        return self.done
+
+    def descr_iternext(self, space):
+        return space.wrap(self.iternext())
+
+    def descr_copy(self, space):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    def descr_debug_print(self, space):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    def descr_enable_external_loop(self, space):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    @unwrap_spec(axis=int)
+    def descr_remove_axis(self, space, axis):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    def descr_remove_multi_index(self, space, w_multi_index):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    def descr_reset(self, space):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    def descr_get_operands(self, space):
+        l_w = []
+        for op in self.seq:
+            l_w.append(op.descr_view(space))
+        return space.newlist(l_w)
+
+    def descr_get_dtypes(self, space):
+        res = [None] * len(self.seq)
+        for i in range(len(self.seq)):
+            res[i] = self.seq[i].descr_get_dtype(space)
+        return space.newtuple(res)
+
+    def descr_get_finished(self, space):
+        return space.wrap(self.done)
+
+    def descr_get_has_delayed_bufalloc(self, space):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    def descr_get_has_index(self, space):
+        return space.wrap(self.tracked_index in ["C", "F"])
+
+    def descr_get_index(self, space):
+        if not self.tracked_index in ["C", "F"]:
+            raise OperationError(space.w_ValueError, space.wrap("Iterator does not have an index"))
+        if self.done:
+            raise OperationError(space.w_ValueError, space.wrap("Iterator is past the end"))
+        return space.wrap(self.index_iter.getvalue())
+
+    def descr_get_has_multi_index(self, space):
+        return space.wrap(self.tracked_index == "multi")
+
+    def descr_get_multi_index(self, space):
+        if not self.tracked_index == "multi":
+            raise OperationError(space.w_ValueError, space.wrap("Iterator is not tracking a multi-index"))
+        if self.done:
+            raise OperationError(space.w_ValueError, space.wrap("Iterator is past the end"))
+        return space.newtuple([space.wrap(x) for x in self.index_iter.index])
+
+    def descr_get_iterationneedsapi(self, space):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    def descr_get_iterindex(self, space):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    def descr_get_itersize(self, space):
+        return space.wrap(support.product(self.shape))
+
+    def descr_get_itviews(self, space):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    def descr_get_ndim(self, space):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    def descr_get_nop(self, space):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    def descr_get_shape(self, space):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+    def descr_get_value(self, space):
+        raise OperationError(space.w_NotImplementedError, space.wrap(
+            'not implemented yet'))
+
+
+ at unwrap_spec(w_flags=WrappedDefault(None), w_op_flags=WrappedDefault(None),
+             w_op_dtypes=WrappedDefault(None), order=str,
+             w_casting=WrappedDefault(None), w_op_axes=WrappedDefault(None),
+             w_itershape=WrappedDefault(None), w_buffersize=WrappedDefault(None))
+def nditer(space, w_seq, w_flags, w_op_flags, w_op_dtypes, w_casting, w_op_axes,
+           w_itershape, w_buffersize, order='K'):
+    return W_NDIter(space, w_seq, w_flags, w_op_flags, w_op_dtypes, w_casting, w_op_axes,
+                    w_itershape, w_buffersize, order)
+
+W_NDIter.typedef = TypeDef(
+    'nditer',
+    __iter__ = interp2app(W_NDIter.descr_iter),
+    __getitem__ = interp2app(W_NDIter.descr_getitem),
+    __setitem__ = interp2app(W_NDIter.descr_setitem),
+    __len__ = interp2app(W_NDIter.descr_len),
+
+    next = interp2app(W_NDIter.descr_next),
+    iternext = interp2app(W_NDIter.descr_iternext),
+    copy = interp2app(W_NDIter.descr_copy),
+    debug_print = interp2app(W_NDIter.descr_debug_print),
+    enable_external_loop = interp2app(W_NDIter.descr_enable_external_loop),
+    remove_axis = interp2app(W_NDIter.descr_remove_axis),
+    remove_multi_index = interp2app(W_NDIter.descr_remove_multi_index),
+    reset = interp2app(W_NDIter.descr_reset),
+
+    operands = GetSetProperty(W_NDIter.descr_get_operands),
+    dtypes = GetSetProperty(W_NDIter.descr_get_dtypes),
+    finished = GetSetProperty(W_NDIter.descr_get_finished),
+    has_delayed_bufalloc = GetSetProperty(W_NDIter.descr_get_has_delayed_bufalloc),
+    has_index = GetSetProperty(W_NDIter.descr_get_has_index),
+    index = GetSetProperty(W_NDIter.descr_get_index),
+    has_multi_index = GetSetProperty(W_NDIter.descr_get_has_multi_index),
+    multi_index = GetSetProperty(W_NDIter.descr_get_multi_index),
+    iterationneedsapi = GetSetProperty(W_NDIter.descr_get_iterationneedsapi),
+    iterindex = GetSetProperty(W_NDIter.descr_get_iterindex),
+    itersize = GetSetProperty(W_NDIter.descr_get_itersize),
+    itviews = GetSetProperty(W_NDIter.descr_get_itviews),
+    ndim = GetSetProperty(W_NDIter.descr_get_ndim),
+    nop = GetSetProperty(W_NDIter.descr_get_nop),
+    shape = GetSetProperty(W_NDIter.descr_get_shape),
+    value = GetSetProperty(W_NDIter.descr_get_value),
+)
diff --git a/pypy/module/micronumpy/strides.py b/pypy/module/micronumpy/strides.py
--- a/pypy/module/micronumpy/strides.py
+++ b/pypy/module/micronumpy/strides.py
@@ -282,14 +282,16 @@
 
 
 @jit.unroll_safe
-def shape_agreement_multiple(space, array_list):
+def shape_agreement_multiple(space, array_list, shape=None):
     """ call shape_agreement recursively, allow elements from array_list to
     be None (like w_out)
     """
-    shape = array_list[0].get_shape()
-    for arr in array_list[1:]:
+    for arr in array_list:
         if not space.is_none(arr):
-            shape = shape_agreement(space, shape, arr)
+            if shape is None:
+                shape = arr.get_shape()
+            else:
+                shape = shape_agreement(space, shape, arr)
     return shape
 
 
diff --git a/pypy/module/micronumpy/test/test_nditer.py b/pypy/module/micronumpy/test/test_nditer.py
new file mode 100644
--- /dev/null
+++ b/pypy/module/micronumpy/test/test_nditer.py
@@ -0,0 +1,302 @@
+import py
+from pypy.module.micronumpy.test.test_base import BaseNumpyAppTest
+
+
+class AppTestNDIter(BaseNumpyAppTest):
+    def test_basic(self):
+        from numpy import arange, nditer
+        a = arange(6).reshape(2,3)
+        r = []
+        for x in nditer(a):
+            r.append(x)
+        assert r == [0, 1, 2, 3, 4, 5]
+        r = []
+
+        for x in nditer(a.T):
+            r.append(x)
+        assert r == [0, 1, 2, 3, 4, 5]
+
+    def test_order(self):
+        from numpy import arange, nditer
+        a = arange(6).reshape(2,3)
+        r = []
+        for x in nditer(a, order='C'):
+            r.append(x)
+        assert r == [0, 1, 2, 3, 4, 5]
+        r = []
+        for x in nditer(a, order='F'):
+            r.append(x)
+        assert r == [0, 3, 1, 4, 2, 5]
+
+    def test_readwrite(self):
+        from numpy import arange, nditer
+        a = arange(6).reshape(2,3)
+        for x in nditer(a, op_flags=['readwrite']):
+            x[...] = 2 * x
+        assert (a == [[0, 2, 4], [6, 8, 10]]).all()
+
+    def test_external_loop(self):
+        from numpy import arange, nditer, array
+        a = arange(24).reshape(2, 3, 4)
+        import sys
+        if '__pypy__' in sys.builtin_module_names:
+            raises(NotImplementedError, nditer, a, flags=['external_loop'])
+            skip('nditer external_loop not implmented')
+        r = []
+        n = 0
+        for x in nditer(a, flags=['external_loop']):
+            r.append(x)
+            n += 1
+        assert n == 1
+        assert (array(r) == range(24)).all()
+        r = []
+        n = 0
+        for x in nditer(a, flags=['external_loop'], order='F'):
+            r.append(x)
+            n += 1
+        assert n == 12
+        assert (array(r) == [[ 0, 12], [ 4, 16], [ 8, 20], [ 1, 13], [ 5, 17], [ 9, 21], [ 2, 14], [ 6, 18], [10, 22], [ 3, 15], [ 7, 19], [11, 23]]).all()
+        e = raises(ValueError, 'r[0][0] = 0')
+        assert str(e.value) == 'assignment destination is read-only'
+        r = []
+        for x in nditer(a.T, flags=['external_loop'], order='F'):
+            r.append(x)
+        array_r = array(r)
+        assert len(array_r.shape) == 2
+        assert array_r.shape == (1,24)
+        assert (array(r) == arange(24)).all()
+
+    def test_index(self):
+        from numpy import arange, nditer
+        a = arange(6).reshape(2,3)
+
+        r = []
+        it = nditer(a, flags=['c_index'])
+        assert it.has_index
+        for value in it:
+            r.append((value, it.index))
+        assert r == [(0, 0), (1, 1), (2, 2), (3, 3), (4, 4), (5, 5)]
+        exc = None
+        try:
+            it.index
+        except ValueError, e:
+            exc = e
+        assert exc
+
+        r = []
+        it = nditer(a, flags=['f_index'])
+        assert it.has_index
+        for value in it:
+            r.append((value, it.index))
+        assert r == [(0, 0), (1, 2), (2, 4), (3, 1), (4, 3), (5, 5)]
+
+    @py.test.mark.xfail(reason="Fortran order not implemented")
+    def test_iters_with_different_order(self):
+        from numpy import nditer, array
+
+        a = array([[1, 2], [3, 4]], order="C")
+        b = array([[1, 2], [3, 4]], order="F")
+
+        it = nditer([a, b])
+
+        assert list(it) == zip(range(1, 5), range(1, 5))
+
+    def test_interface(self):
+        from numpy import arange, nditer, zeros
+        import sys
+        a = arange(6).reshape(2,3)
+        r = []
+        it = nditer(a, flags=['f_index'])
+        while not it.finished:
+            r.append((it[0], it.index))
+            it.iternext()
+        assert r == [(0, 0), (1, 2), (2, 4), (3, 1), (4, 3), (5, 5)]
+        it = nditer(a, flags=['multi_index'], op_flags=['writeonly'])
+        if '__pypy__' in sys.builtin_module_names:
+            raises(NotImplementedError, 'it[0] = 3')
+            skip('nditer.__setitem__ not implmented')
+        while not it.finished:
+            it[0] = it.multi_index[1] - it.multi_index[0]
+            it.iternext()
+        assert (a == [[0, 1, 2], [-1, 0, 1]]).all()
+        # b = zeros((2, 3))
+        # exc = raises(ValueError, nditer, b, flags=['c_index', 'external_loop'])
+        # assert str(exc.value).startswith("Iterator flag EXTERNAL_LOOP cannot")
+
+    def test_buffered(self):
+        from numpy import arange, nditer, array
+        a = arange(6).reshape(2,3)
+        import sys
+        if '__pypy__' in sys.builtin_module_names:
+            raises(NotImplementedError, nditer, a, flags=['buffered'])
+            skip('nditer buffered not implmented')
+        r = []
+        for x in nditer(a, flags=['external_loop', 'buffered'], order='F'):
+            r.append(x)
+        array_r = array(r)
+        assert len(array_r.shape) == 2
+        assert array_r.shape == (1, 6)
+        assert (array_r == [0, 3, 1, 4, 2, 5]).all()
+
+    def test_op_dtype(self):
+        from numpy import arange, nditer, sqrt, array
+        a = arange(6).reshape(2,3) - 3
+        exc = raises(TypeError, nditer, a, op_dtypes=['complex'])
+        assert str(exc.value).startswith("Iterator operand required copying or buffering")
+        r = []
+        for x in nditer(a, op_flags=['readonly','copy'],
+                        op_dtypes=['complex128']):
+            r.append(sqrt(x))
+        assert abs((array(r) - [1.73205080757j, 1.41421356237j, 1j, 0j,
+                1+0j, 1.41421356237+0j]).sum()) < 1e-5
+        r = []
+        for x in nditer(a, op_flags=['copy'],
+                        op_dtypes=['complex128']):
+            r.append(sqrt(x))
+        assert abs((array(r) - [1.73205080757j, 1.41421356237j, 1j, 0j,
+                            1+0j, 1.41421356237+0j]).sum()) < 1e-5
+        multi = nditer([None, array([2, 3], dtype='int64'), array(2., dtype='double')],
+                       op_dtypes = ['int64', 'int64', 'float64'],
+                       op_flags = [['writeonly', 'allocate'], ['readonly'], ['readonly']])
+        for a, b, c in multi:
+            a[...] = b * c
+        assert (multi.operands[0] == [4, 6]).all()
+
+    def test_casting(self):
+        from numpy import arange, nditer
+        import sys
+        a = arange(6.)
+        if '__pypy__' in sys.builtin_module_names:
+            raises(NotImplementedError, nditer, a, flags=['buffered'], op_dtypes=['float32'])
+            skip('nditer casting not implemented yet')
+        exc = raises(TypeError, nditer, a, flags=['buffered'], op_dtypes=['float32'])
+        assert str(exc.value).startswith("Iterator operand 0 dtype could not be cast")
+        r = []
+        for x in nditer(a, flags=['buffered'], op_dtypes=['float32'],
+                                casting='same_kind'):
+            r.append(x)
+        assert r == [0., 1., 2., 3., 4., 5.]
+        exc = raises(TypeError, nditer, a, flags=['buffered'],
+                        op_dtypes=['int32'], casting='same_kind')
+        assert str(exc.value).startswith("Iterator operand 0 dtype could not be cast")
+        r = []
+        b = arange(6)
+        exc = raises(TypeError, nditer, b, flags=['buffered'], op_dtypes=['float64'],
+                                op_flags=['readwrite'], casting='same_kind')
+        assert str(exc.value).startswith("Iterator requested dtype could not be cast")
+
+    def test_broadcast(self):
+        from numpy import arange, nditer
+        a = arange(3)
+        b = arange(6).reshape(2,3)
+        r = []
+        it = nditer([a, b])
+        assert it.itersize == 6
+        for x,y in it:
+            r.append((x, y))
+        assert r == [(0, 0), (1, 1), (2, 2), (0, 3), (1, 4), (2, 5)]
+        a = arange(2)
+        exc = raises(ValueError, nditer, [a, b])
+        assert str(exc.value).find('shapes (2) (2,3)') > 0
+
+    def test_outarg(self):
+        from numpy import nditer, zeros, arange
+        import sys
+        if '__pypy__' in sys.builtin_module_names:
+            raises(NotImplementedError, nditer, [1, 2], flags=['external_loop'])
+            skip('nditer external_loop not implmented')
+
+        def square1(a):
+            it = nditer([a, None])
+            for x,y in it:
+                y[...] = x*x
+            return it.operands[1]
+        assert (square1([1, 2, 3]) == [1, 4, 9]).all()
+
+        def square2(a, out=None):
+            it = nditer([a, out], flags=['external_loop', 'buffered'],
+                        op_flags=[['readonly'],
+                                  ['writeonly', 'allocate', 'no_broadcast']])
+            for x,y in it:
+                y[...] = x*x
+            return it.operands[1]
+        assert (square2([1, 2, 3]) == [1, 4, 9]).all()
+        b = zeros((3, ))
+        c = square2([1, 2, 3], out=b)
+        assert (c == [1., 4., 9.]).all()
+        assert (b == c).all()
+        exc = raises(ValueError, square2, arange(6).reshape(2, 3), out=b)
+        assert str(exc.value).find('cannot be broadcasted') > 0
+
+    def test_outer_product(self):
+        from numpy import nditer, arange
+        a = arange(3)
+        import sys
+        if '__pypy__' in sys.builtin_module_names:
+            raises(NotImplementedError, nditer, a, flags=['external_loop'])
+            skip('nditer external_loop not implmented')
+        b = arange(8).reshape(2,4)
+        it = nditer([a, b, None], flags=['external_loop'],
+                    op_axes=[[0, -1, -1], [-1, 0, 1], None])
+        for x, y, z in it:
+            z[...] = x*y
+        assert it.operands[2].shape == (3, 2, 4)
+        for i in range(a.size):
+            assert (it.operands[2][i] == a[i]*b).all()
+
+    def test_reduction(self):
+        from numpy import nditer, arange, array
+        import sys
+        a = arange(24).reshape(2, 3, 4)
+        b = array(0)
+        if '__pypy__' in sys.builtin_module_names:
+            raises(NotImplementedError, nditer, [a, b], flags=['reduce_ok'])
+            skip('nditer reduce_ok not implemented yet')
+        #reduction operands must be readwrite
+        for x, y in nditer([a, b], flags=['reduce_ok', 'external_loop'],
+                            op_flags=[['readonly'], ['readwrite']]):
+            y[...] += x
+        assert b == 276
+        assert b == a.sum()
+
+        # reduction and allocation requires op_axes and initialization
+        it = nditer([a, None], flags=['reduce_ok', 'external_loop'],
+                    op_flags=[['readonly'], ['readwrite', 'allocate']],
+                    op_axes=[None, [0,1,-1]])
+        it.operands[1][...] = 0
+        for x, y in it:
+            y[...] += x
+
+        assert (it.operands[1] == [[6, 22, 38], [54, 70, 86]]).all()
+        assert (it.operands[1] == a.sum(axis=2)).all()
+
+        # previous example with buffering, requires more flags and reset
+        it = nditer([a, None], flags=['reduce_ok', 'external_loop',
+                                      'buffered', 'delay_bufalloc'],
+                    op_flags=[['readonly'], ['readwrite', 'allocate']],
+                    op_axes=[None, [0,1,-1]])
+        it.operands[1][...] = 0
+        it.reset()
+        for x, y in it:
+            y[...] += x
+
+        assert (it.operands[1] == [[6, 22, 38], [54, 70, 86]]).all()
+        assert (it.operands[1] == a.sum(axis=2)).all()
+
+    def test_get_dtypes(self):
+        from numpy import array, nditer
+        x = array([1, 2])
+        y = array([1.0, 2.0])
+        assert nditer([x, y]).dtypes == (x.dtype, y.dtype)
+
+    def test_multi_index(self):
+        import numpy as np
+        a = np.arange(6).reshape(2, 3)
+        it = np.nditer(a, flags=['multi_index'])
+        res = []
+        while not it.finished:
+            res.append((it[0], it.multi_index))
+            it.iternext()
+        assert res == [(0, (0, 0)), (1, (0, 1)),
+                       (2, (0, 2)), (3, (1, 0)),
+                       (4, (1, 1)), (5, (1, 2))]
diff --git a/pypy/objspace/std/celldict.py b/pypy/objspace/std/celldict.py
--- a/pypy/objspace/std/celldict.py
+++ b/pypy/objspace/std/celldict.py
@@ -3,15 +3,18 @@
 indirection is introduced to make the version tag change less often.
 """
 
+from rpython.rlib import jit, rerased
+
 from pypy.interpreter.baseobjspace import W_Root
-from pypy.objspace.std.dictmultiobject import create_iterator_classes
-from pypy.objspace.std.dictmultiobject import DictStrategy, _never_equal_to_string
-from pypy.objspace.std.dictmultiobject import ObjectDictStrategy
-from rpython.rlib import jit, rerased
+from pypy.objspace.std.dictmultiobject import (
+    DictStrategy, ObjectDictStrategy, _never_equal_to_string,
+    create_iterator_classes)
+
 
 class VersionTag(object):
     pass
 
+
 class ModuleCell(W_Root):
     def __init__(self, w_value=None):
         self.w_value = w_value
@@ -19,11 +22,17 @@
     def __repr__(self):
         return "<ModuleCell: %s>" % (self.w_value, )
 
+
 def unwrap_cell(w_value):
     if isinstance(w_value, ModuleCell):
         return w_value.w_value
     return w_value
 
+
+def _wrapkey(space, key):
+    return space.wrap(key)
+
+
 class ModuleDictStrategy(DictStrategy):
 
     erase, unerase = rerased.new_erasing_pair("modulecell")
@@ -55,7 +64,7 @@
     def setitem(self, w_dict, w_key, w_value):
         space = self.space
         if space.is_w(space.type(w_key), space.w_str):
-            self.setitem_str(w_dict, self.space.str_w(w_key), w_value)
+            self.setitem_str(w_dict, space.str_w(w_key), w_value)
         else:
             self.switch_to_object_strategy(w_dict)
             w_dict.setitem(w_key, w_value)
@@ -66,8 +75,8 @@
             cell.w_value = w_value
             return
         if cell is not None:
-            # If the new value and the current value are the same, don't create a
-            # level of indirection, or mutate the version.
+            # If the new value and the current value are the same, don't
+            # create a level of indirection, or mutate the version.
             if self.space.is_w(w_value, cell):
                 return
             w_value = ModuleCell(w_value)
@@ -121,8 +130,8 @@
             return w_dict.getitem(w_key)
 
     def getitem_str(self, w_dict, key):
-        w_res = self.getdictvalue_no_unwrapping(w_dict, key)
-        return unwrap_cell(w_res)
+        cell = self.getdictvalue_no_unwrapping(w_dict, key)
+        return unwrap_cell(cell)
 
     def w_keys(self, w_dict):
         space = self.space
@@ -136,37 +145,43 @@
     def items(self, w_dict):
         space = self.space
         iterator = self.unerase(w_dict.dstorage).iteritems
-        return [space.newtuple([space.wrap(key), unwrap_cell(cell)])
-                    for key, cell in iterator()]
+        return [space.newtuple([_wrapkey(space, key), unwrap_cell(cell)])
+                for key, cell in iterator()]
 
     def clear(self, w_dict):
         self.unerase(w_dict.dstorage).clear()
         self.mutated()
 
     def popitem(self, w_dict):
+        space = self.space
         d = self.unerase(w_dict.dstorage)
-        key, w_value = d.popitem()
+        key, cell = d.popitem()
         self.mutated()
-        return self.space.wrap(key), unwrap_cell(w_value)
+        return _wrapkey(space, key), unwrap_cell(cell)
 
     def switch_to_object_strategy(self, w_dict):
+        space = self.space
         d = self.unerase(w_dict.dstorage)
-        strategy = self.space.fromcache(ObjectDictStrategy)
+        strategy = space.fromcache(ObjectDictStrategy)
         d_new = strategy.unerase(strategy.get_empty_storage())
         for key, cell in d.iteritems():
-            d_new[self.space.wrap(key)] = unwrap_cell(cell)
+            d_new[_wrapkey(space, key)] = unwrap_cell(cell)
         w_dict.strategy = strategy
         w_dict.dstorage = strategy.erase(d_new)
 
     def getiterkeys(self, w_dict):
         return self.unerase(w_dict.dstorage).iterkeys()
+
     def getitervalues(self, w_dict):
         return self.unerase(w_dict.dstorage).itervalues()
+
     def getiteritems(self, w_dict):
         return self.unerase(w_dict.dstorage).iteritems()
-    def wrapkey(space, key):
-        return space.wrap(key)
+
+    wrapkey = _wrapkey
+
     def wrapvalue(space, value):
         return unwrap_cell(value)
 
+
 create_iterator_classes(ModuleDictStrategy)
diff --git a/pypy/objspace/std/kwargsdict.py b/pypy/objspace/std/kwargsdict.py
--- a/pypy/objspace/std/kwargsdict.py
+++ b/pypy/objspace/std/kwargsdict.py
@@ -1,12 +1,19 @@
-## ----------------------------------------------------------------------------
-## dict strategy (see dictmultiobject.py)
+"""dict implementation specialized for keyword argument dicts.
 
-from rpython.rlib import rerased, jit
+Based on two lists containing unwrapped key value pairs.
+"""
+
+from rpython.rlib import jit, rerased
+
 from pypy.objspace.std.dictmultiobject import (
     BytesDictStrategy, DictStrategy, EmptyDictStrategy, ObjectDictStrategy,
     create_iterator_classes)
 
 
+def _wrapkey(space, key):
+    return space.wrap(key)
+
+
 class EmptyKwargsDictStrategy(EmptyDictStrategy):
     def switch_to_bytes_strategy(self, w_dict):
         strategy = self.space.fromcache(KwargsDictStrategy)
@@ -21,7 +28,7 @@
     unerase = staticmethod(unerase)
 
     def wrap(self, key):
-        return self.space.wrap(key)
+        return _wrapkey(self.space, key)
 
     def unwrap(self, wrapped):
         return self.space.str_w(wrapped)
@@ -117,16 +124,14 @@
     def items(self, w_dict):
         space = self.space
         keys, values_w = self.unerase(w_dict.dstorage)
-        result = []
-        for i in range(len(keys)):
-            result.append(space.newtuple([self.wrap(keys[i]), values_w[i]]))
-        return result
+        return [space.newtuple([self.wrap(keys[i]), values_w[i]])
+                for i in range(len(keys))]
 
     def popitem(self, w_dict):
         keys, values_w = self.unerase(w_dict.dstorage)
         key = keys.pop()
         w_value = values_w.pop()
-        return (self.wrap(key), w_value)
+        return self.wrap(key), w_value
 
     def clear(self, w_dict):
         w_dict.dstorage = self.get_empty_storage()
@@ -164,17 +169,15 @@
         keys = self.unerase(w_dict.dstorage)[0]
         return iter(range(len(keys)))
 
-    def wrapkey(space, key):
-        return space.wrap(key)
+    wrapkey = _wrapkey
 
 
 def next_item(self):
     strategy = self.strategy
     assert isinstance(strategy, KwargsDictStrategy)
     for i in self.iterator:
-        keys, values_w = strategy.unerase(
-            self.dictimplementation.dstorage)
-        return self.space.wrap(keys[i]), values_w[i]
+        keys, values_w = strategy.unerase(self.dictimplementation.dstorage)
+        return _wrapkey(self.space, keys[i]), values_w[i]
     else:
         return None, None
 
diff --git a/pypy/objspace/std/test/test_celldict.py b/pypy/objspace/std/test/test_celldict.py
--- a/pypy/objspace/std/test/test_celldict.py
+++ b/pypy/objspace/std/test/test_celldict.py
@@ -1,42 +1,47 @@
 import py
+
+from pypy.objspace.std.celldict import ModuleDictStrategy
 from pypy.objspace.std.dictmultiobject import W_DictMultiObject
-from pypy.objspace.std.celldict import ModuleCell, ModuleDictStrategy
-from pypy.objspace.std.test.test_dictmultiobject import FakeSpace, \
-        BaseTestRDictImplementation, BaseTestDevolvedDictImplementation
-from pypy.interpreter import gateway
+from pypy.objspace.std.test.test_dictmultiobject import (
+    BaseTestRDictImplementation, BaseTestDevolvedDictImplementation, FakeSpace,
+    FakeString)
 
 space = FakeSpace()
 
 class TestCellDict(object):
+    FakeString = FakeString
+
     def test_basic_property_cells(self):
         strategy = ModuleDictStrategy(space)
         storage = strategy.get_empty_storage()
         d = W_DictMultiObject(space, strategy, storage)
 
         v1 = strategy.version
-        d.setitem("a", 1)
+        key = "a"
+        w_key = self.FakeString(key)
+        d.setitem(w_key, 1)
         v2 = strategy.version
         assert v1 is not v2
-        assert d.getitem("a") == 1
-        assert d.strategy.getdictvalue_no_unwrapping(d, "a") == 1
+        assert d.getitem(w_key) == 1
+        assert d.strategy.getdictvalue_no_unwrapping(d, key) == 1
 
-        d.setitem("a", 2)
+        d.setitem(w_key, 2)
         v3 = strategy.version
         assert v2 is not v3
-        assert d.getitem("a") == 2
-        assert d.strategy.getdictvalue_no_unwrapping(d, "a").w_value == 2
+        assert d.getitem(w_key) == 2
+        assert d.strategy.getdictvalue_no_unwrapping(d, key).w_value == 2
 
-        d.setitem("a", 3)
+        d.setitem(w_key, 3)
         v4 = strategy.version
         assert v3 is v4
-        assert d.getitem("a") == 3
-        assert d.strategy.getdictvalue_no_unwrapping(d, "a").w_value == 3
+        assert d.getitem(w_key) == 3
+        assert d.strategy.getdictvalue_no_unwrapping(d, key).w_value == 3
 
-        d.delitem("a")
+        d.delitem(w_key)
         v5 = strategy.version
         assert v5 is not v4
-        assert d.getitem("a") is None
-        assert d.strategy.getdictvalue_no_unwrapping(d, "a") is None
+        assert d.getitem(w_key) is None
+        assert d.strategy.getdictvalue_no_unwrapping(d, key) is None
 
     def test_same_key_set_twice(self):
         strategy = ModuleDictStrategy(space)
diff --git a/pypy/objspace/std/test/test_dictmultiobject.py b/pypy/objspace/std/test/test_dictmultiobject.py
--- a/pypy/objspace/std/test/test_dictmultiobject.py
+++ b/pypy/objspace/std/test/test_dictmultiobject.py
@@ -1254,12 +1254,13 @@
                 return other == "s"
 
         d = self.get_impl()
-        d.setitem("s", 12)
-        assert d.getitem("s") == 12
-        assert d.getitem(F()) == d.getitem("s")
+        w_key = FakeString("s")
+        d.setitem(w_key, 12)
+        assert d.getitem(w_key) == 12
+        assert d.getitem(F()) == d.getitem(w_key)
 
         d = self.get_impl()
-        x = d.setdefault("s", 12)
+        x = d.setdefault(w_key, 12)
         assert x == 12
         x = d.setdefault(F(), 12)
         assert x == 12
@@ -1269,10 +1270,10 @@
         assert x == 12
 
         d = self.get_impl()
-        d.setitem("s", 12)
+        d.setitem(w_key, 12)
         d.delitem(F())
 
-        assert "s" not in d.w_keys()
+        assert w_key not in d.w_keys()
         assert F() not in d.w_keys()
 
 class TestBytesDictImplementation(BaseTestRDictImplementation):
diff --git a/rpython/translator/c/src/instrument.c b/rpython/translator/c/src/instrument.c
--- a/rpython/translator/c/src/instrument.c
+++ b/rpython/translator/c/src/instrument.c
@@ -6,10 +6,10 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
 #ifndef _WIN32
 #include <sys/mman.h>
-#include <stdlib.h>
-#include <stdio.h>
 #include <unistd.h>
 #else
 #include <windows.h>
diff --git a/rpython/translator/c/src/threadlocal.h b/rpython/translator/c/src/threadlocal.h
--- a/rpython/translator/c/src/threadlocal.h
+++ b/rpython/translator/c/src/threadlocal.h
@@ -2,6 +2,7 @@
 
 #ifdef _WIN32
 
+#include <WinSock2.h>
 #include <windows.h>
 #define __thread __declspec(thread)
 typedef DWORD RPyThreadTLS;


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