Implement MutableSequence.clear()

[elibendersky]

BPO	11388
Nosy	@birkenfeld, @rhettinger, @terryjreedy, @ncoghlan, @bitdancer, @durban

^{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 2011-04-08.18:40:36.658>
created_at = <Date 2011-03-03.18:36:45.687>
labels = ['easy', 'type-bug', 'library']
title = 'Implement MutableSequence.clear()'
updated_at = <Date 2011-04-08.18:40:36.657>
user = 'https://bugs.python.org/elibendersky'

bugs.python.org fields:

activity = <Date 2011-04-08.18:40:36.657>
actor = 'eli.bendersky'
assignee = 'eli.bendersky'
closed = True
closed_date = <Date 2011-04-08.18:40:36.658>
closer = 'eli.bendersky'
components = ['Library (Lib)']
creation = <Date 2011-03-03.18:36:45.687>
creator = 'eli.bendersky'
dependencies = []
files = []
hgrepos = []
issue_num = 11388
keywords = ['easy']
message_count = 8.0
messages = ['129994', '129997', '129998', '130024', '130031', '130040', '130046', '130468']
nosy_count = 8.0
nosy_names = ['georg.brandl', 'rhettinger', 'terry.reedy', 'ncoghlan', 'stutzbach', 'r.david.murray', 'eli.bendersky', 'daniel.urban']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'needs patch'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue11388'
versions = ['Python 3.3']

[elibendersky]

Now that both list and bytearray support the clear() method (see issue bpo-10516), MutableSequence.clear() has to be implemented.

This is pending on commit for issue bpo-11386, which fixes the exception thrown by bytearray.pop() when the bytearray is empty.

[rhettinger]

s/has to be/could be/

But yes, this would be a worthwhile addition to MutableSequence :-)

[birkenfeld]

+1.

[elibendersky]

Committed in revision 88740

The non-abstract methods of MutableSequence and other classes currently seem to have no unit-tests. Any ideas about the best testing strategy for them?

[birkenfeld]

Creating a minimal concrete subclass and testing with that would be the obvious thing.

[rhettinger]

Please also update the table entry for MutableSequence in Doc/library/collections.abc.rst

[elibendersky]

Documentation fix and some unit tests committed in revision 88742

[bitdancer]

Eli, did you leave this open on purpose or can it be closed?