[New-bugs-announce] [issue33552] f-strings and string annotations

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

There are problems with converting annotations containing f-strings into strings (from __future__ import annotations). For example f'''{"'"}''' is converted to f'{"\'"}', but the latter is a syntax error.

>>> from __future__ import annotations
>>> x: f'''{"'"}'''
>>> print(__annotations__['x'])
f'{"\'"}'
>>> x: f'{"\'"}'
  File "<stdin>", line 1
SyntaxError: f-string expression part cannot include a backslash

More complex examples:

f"""{"'''"}"""
f"""{"'" '"'}"""
f"""{"'''"}""" f'''{'"""'}'''

----------
components: Interpreter Core
messages: 316886
nosy: eric.smith, lukasz.langa, serhiy.storchaka
priority: normal
severity: normal
status: open
title: f-strings and string annotations
type: behavior
versions: Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33552>
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