Note item 6 of http://docs.python.org/2.7/library/stdtypes.html#mutable-sequence-types is a bit misleading.  

It states: "The pop() method is only supported by the list and array types. The optional argument i defaults to -1, so that by default the last item is removed and returned."  

However, pop() is also a method of sets, which are neither lists or arrays.

Well, set supporting it is irrelevant to that section, which is about mutable sequence types.  However, bytearray also supports pop, so I think perhaps that sentence should just be deleted.  The whole footnote is gone in the Python3. docs.

+1 for simply deleting that bit

Here's the patch

Thanks, but the proposal for 2.7 is to just delete the sentence about list/array, not the whole footnote.  Unless someone can think of a mutable list type in 2.7 that does not support pop...

Got it. Looks like I was confused by absence of this footnote in Python 3 documentation) Here's updated patch.

New changeset 3598805d7636 by R David Murray in branch '2.7':
#20063: Remove inaccurate/confusing statement about support of 'pop' method.
http://hg.python.org/cpython/rev/3598805d7636

Thanks, Gennandiy.