Comment #5 on issue 2491 by renato.c...@gmail.com: order_iter and iterable
function
http://code.google.com/p/sympy/issues/detail?id=2491
Just to be sure, I link here all the relevant documentation.
python 2.5: http://docs.python.org/release/2.5/lib/typesseq.html
python 2.7:
http://docs.python.org/library/stdtypes.html#sequence-types-str-unicode-list-tuple-bytearray-buffer-xrange
python 3.1:
http://docs.python.org/release/3.1.3/library/stdtypes.html#sequence-types-str-bytes-bytearray-list-tuple-range
python 3.3a:
http://docs.python.org/dev/py3k/library/stdtypes.html#sequence-types-str-bytes-bytearray-list-tuple-range
It looks like __getitem__ is a safe path, both for 2.5 and py3. Of course
for python2.6+ we could use ABCs from the collections module.
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