New submission from Dmitry Kazakov <[email protected]>:
A few of the methods of collections.UserString return objects of type str when
one would expect instances of UserString or a subclass. Here's an example for
UserString.join:
>>> s = UserString(', ').join(['a', 'b', 'c']); print(repr(s), type(s))
'a, b, c' <class 'str'>
This *looks* like a bug to me, but since I was unable to find similar bug
reports, and this behaviour has existed for years, I'm not too sure.
Same holds for UserString.format and UserString.format_map, which were added
recently (issue 22189):
>>> s = UserString('{}').format(1); print(repr(s), type(s))
'1' <class 'str'>
At least, this output is inconsistent with %-based formatting:
>>> s = UserString('%d') % 1; print(repr(s), type(s))
'1' <class 'collections.UserString'>
----------
components: Library (Lib)
messages: 304761
nosy: vaultah
priority: normal
severity: normal
status: open
title: Several methods of collections.UserString do not return instances of
UserString or its subclasses
type: behavior
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Python tracker <[email protected]>
<https://bugs.python.org/issue31841>
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