New submission from Raymond Hettinger:
Currently, the Sequence ABC doesn't support start and stop arguments for the
index() method which limits its usefulness in doing repeated searches
(iterating over a target value) and which limits it substitutablity for various
concrete sequences such as tuples, lists, strings, bytes, bytearrays, etc.
>>> help(Sequence.index)
Help on method index in module _abcoll:
index(self, value) unbound _abcoll.Sequence method
S.index(value) -> integer -- return first index of value.
Raises ValueError if the value is not present.
>>> help(list.index)
Help on method_descriptor:
index(...)
L.index(value, [start, [stop]]) -> integer -- return first index of value.
Raises ValueError if the value is not present.
>>> help(str.index)
Help on method_descriptor:
index(...)
S.index(sub [,start [,end]]) -> int
Like S.find() but raise ValueError when the substring is not found.
>>> help(tuple.index)
Help on method_descriptor:
index(...)
T.index(value, [start, [stop]]) -> integer -- return first index of value.
Raises ValueError if the value is not present.
>>> help(bytes.index)
Help on method_descriptor:
index(...)
S.index(sub [,start [,end]]) -> int
Like S.find() but raise ValueError when the substring is not found.
>>> help(bytearray.index)
Help on method_descriptor:
index(...)
B.index(sub [,start [,end]]) -> int
Like B.find() but raise ValueError when the subsection is not found.
----------
assignee: rhettinger
components: Library (Lib)
messages: 232904
nosy: rhettinger
priority: normal
severity: normal
status: open
title: Add start and stop parameters to the Sequence.index() ABC mixin method
versions: Python 3.5
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23086>
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