[Python-bugs-list] [ python-Bugs-493951 ] string.{starts,ends}with vs slices

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Bugs item #493951, was opened at 2001-12-16 11:23
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Category: Python Interpreter Core
Group: None
Status: Open
Resolution: None
Priority: 7
Submitted By: Tim Peters (tim_one)
Assigned to: Barry Warsaw (bwarsaw)
Summary: string.{starts,ends}with vs slices

Initial Comment:
The attached test shows many cases where 
string.startswith() and string.endswith() fail to 
handle negative slice indices correctly.  The failures 
are in both the start and end indices.  I stumbled 
into this when tracking down why (what turned out to 
be) this didn't work:

>>> file = 'difflib.pyc'
>>> file.endswith('.py', 0, -1) # should be 1
0
>>> file[0:-1].endswith('.py')  # like this is
1
>>>

Can we risk changing this for 2.2?  Don't know.  If 
not, reduce the priority.

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>Comment By: Tim Peters (tim_one)
Date: 2001-12-16 11:24

Message:
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user_id=31435

Attached the test case.

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