[Patches] [Patch #102864] prototype closure implementation (PEP 227)

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Patch #102864 has been updated. 

Project: python
Category: core (C code)
Status: Open
Submitted by: jhylton
Assigned to : gvanrossum
Summary: prototype closure implementation (PEP 227)

Follow-Ups:

Date: 2000-Dec-15 15:29
By: jhylton

Comment:
Guido,

Here's a very rough implementation of closures.  It uses flat closures that do not track rebindings of names in its original namespace.  This is discussed briefly in the PEP; it should be straightforward to add a level of indirection to fix this.

I rushed to get something implemented today; it's not the cleanest code.  The changes to compile.c are particularly hackish, because the new function find_names() does a lot of work that can simplify code generation for LOAD_NAME, etc. and probably eliminate the need for a separate optimize() pass.  I haven't made any attempt to integrate the closure creation cleanly, though; it's just wedged in there.

The patch deals with functions only.  Ultimately, classes will have to grow closures, too.  The simple examples using classes should work, e.g.

def make_adder(x):
    def adder(y):
        return x + y
    return adder
dec = make_adder(-1)
dec(1) == 0

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