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__getitem__() doesn't capture all slices if class inherits from list, tuple or str #47704
Description
| BPO | 3454 |
|---|---|
| Nosy | @amauryfa |
| Files |
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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GitHub fields:
assignee = None
closed_at = <Date 2008-07-27.21:17:57.817>
created_at = <Date 2008-07-27.19:58:01.650>
labels = ['interpreter-core', 'performance']
title = "__getitem__() doesn't capture all slices if class inherits from list, tuple or str"
updated_at = <Date 2008-07-27.21:17:57.775>
user = 'https://bugs.python.org/johnf'bugs.python.org fields:
activity = <Date 2008-07-27.21:17:57.775>
actor = 'amaury.forgeotdarc'
assignee = 'none'
closed = True
closed_date = <Date 2008-07-27.21:17:57.817>
closer = 'amaury.forgeotdarc'
components = ['Interpreter Core']
creation = <Date 2008-07-27.19:58:01.650>
creator = 'johnf'
dependencies = []
files = ['10992']
hgrepos = []
issue_num = 3454
keywords = []
message_count = 1.0
messages = ['70329']
nosy_count = 2.0
nosy_names = ['amaury.forgeotdarc', 'johnf']
pr_nums = []
priority = 'normal'
resolution = 'wont fix'
stage = None
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue3454'
versions = ['Python 2.5']
Activity
amauryfa commentedon Jul 27, 2008
When executing self[i:j], the __getslice__(self,i,j) method is called
first, if it exists. See
http://docs.python.org/ref/sequence-methods.html
Yes, the __(get|set|del)slice__ methods are deprecated since 2.0, but
for compatibility the built-in types must keep defining them. You may
want to override them as well if your class inherit from such a type.
With python 3.0 the __getslice__ slots were removed, and __getitem__ is
called in all cases.