Hello, Could you help me to clarify the following idlsave data accessing issue? Quick update: This seems to be an issue with IPython. s1['dn'] call works fine within regular python shell. I1 from scipy import io I2 s1 = io.idl.readsav('test.sav') I3 s1? Type: AttrDict Base Class: <class 'scipy.io.idl.AttrDict'> String Form: {'dn': array([ 1.02282184e+07, 1.05383408e+07, 1.08758739e+07, 1.12449965e+07, 1. <...> (('r', 'R'), '>f8'), (('v', 'V'), '>f8')]), 'tfit': array([ 4.82394886e+02, 4.18176107e-01])} Namespace: Interactive Length: 11 File: /usr/lib64/python2.7/site-packages/scipy/io/idl.py Definition: s1(self, name) ### Why is the following call failing? ### I4 s1['dn'] --------------------------------------------------------------------------- KeyError Traceback (most recent call last) /home/gsever/Desktop/python-repo/ipython/IPython/core/prefilter.pyc in prefilter_lines(self, lines, continue_prompt) 358 for lnum, line in enumerate(llines) ]) 359 else: --> 360 out = self.prefilter_line(llines[0], continue_prompt) 361 362 return out /home/gsever/Desktop/python-repo/ipython/IPython/core/prefilter.pyc in prefilter_line(self, line, continue_prompt) 333 return normal_handler.handle(line_info) 334 --> 335 prefiltered = self.prefilter_line_info(line_info) 336 # print "prefiltered line: %r" % prefiltered 337 return prefiltered /home/gsever/Desktop/python-repo/ipython/IPython/core/prefilter.pyc in prefilter_line_info(self, line_info) 273 # print "prefilter_line_info: ", line_info 274 handler = self.find_handler(line_info) --> 275 return handler.handle(line_info) 276 277 def find_handler(self, line_info): /home/gsever/Desktop/python-repo/ipython/IPython/core/prefilter.pyc in handle(self, line_info) 813 814 force_auto = isinstance(obj, IPyAutocall) --> 815 auto_rewrite = getattr(obj, 'rewrite', True) 816 817 if esc == ESC_QUOTE: /usr/lib64/python2.7/site-packages/scipy/io/idl.pyc in __getitem__(self, name) 657 658 def __getitem__(self, name): --> 659 return super(AttrDict, self).__getitem__(name.lower()) 660 661 def __setitem__(self, key, value): KeyError: 'rewrite' Back then I was accessing this key via (when idlsave was a separate module): s1.variables['dn'] but it is long gone in the scipy. The following works. Is this the correct way to access variables from this dictionary? I14 s1.get('dn') O14 array([ 1.02282184e+07, 1.05383408e+07, 1.08758739e+07, 1.12449965e+07, 1.16508267e+07, 1.20997100e+07, Thanks. -- Gökhan