[issue27252] Make dict views copyable

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


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resolution:  -> rejected
stage: patch review -> resolved
status: open -> closed

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[issue27252] Make dict views copyable

[Raymond Hettinger]

Raymond Hettinger added the comment:

See also:  http://bugs.python.org/issue27253

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[issue27252] Make dict views copyable

[Raymond Hettinger]

Raymond Hettinger added the comment:

I think we should stop adding features like this without actual user requests 
and real use cases to show necessity and to inform the design.

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[issue27252] Make dict views copyable

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I didn't encounter this.

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[issue27252] Make dict views copyable

[Guido van Rossum]

Guido van Rossum added the comment:

I'm still not clear about the use case -- have you heard from people who had to 
work around the current situation?  Use of the copy module is often a code 
smell in my experience, so I don't want to encourage it.

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[issue27252] Make dict views copyable

[Serhiy Storchaka]

New submission from Serhiy Storchaka:

Proposed patch adds support of dict views in the copy module.

Since dict views are immutable, copy.copy() just returns the same object.

copy.deepcopy() returns a frozenset for the dict_keys object, a tuple for the 
dict_values object, and a dict_items object for the dict_items object. Only 
needed data is copied (keys for dict_keys, values for dict_values).

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components: Library (Lib)
files: dict_views_copy.patch
keywords: patch
messages: 267701
nosy: gvanrossum, rhettinger, serhiy.storchaka
priority: normal
severity: normal
stage: patch review
status: open
title: Make dict views copyable
type: enhancement
versions: Python 3.6
Added file: http://bugs.python.org/file43280/dict_views_copy.patch

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