New submission from bizywizy :
collections.UserString.format and collections.UserString.format_map return a
string instaed of UserString.
This is quite weird because I expect that the %-syntax and `format` method have
to produce the same result.
```
>>> isinstance(UserString('Hello %s') % 'World', UserString)
True
>>> isinstance(UserString('Hello {}').format('World'), UserString)
False
```
--
components: Library (Lib)
messages: 360101
nosy: bizywizy
priority: normal
severity: normal
status: open
title: collections.UserString format and format_map return a string
type: behavior
versions: Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9
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<https://bugs.python.org/issue39354>
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