[New-bugs-announce] [issue17287] slice inconsistency

[Elazar Gershuni]

New submission from Elazar Gershuni:

slice behavior is not consistent for negative lower or upper arguments, which could be surprising:

>>> 'hello'[:-2]
'hel'
>>> 'hello'[:-1]
'hell'
>>> 'hello'[:-0]
''

this is obvious when written as literal, but not so obvious when using variables in expressions like 'fullname[:-len(lastname)]'. same goes for 'lower'.

----------
components: None
messages: 182874
nosy: elazar
priority: normal
severity: normal
status: open
title: slice inconsistency
type: enhancement
versions: Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17287>
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