New submission from Serhiy Storchaka:
Python parser supports only ' ', '\t', '\x0c' and '\r' as whitespaces. The
parser of f-strings raises incorrect error messages for subexpressions
consistent only from whitespaces, if they contain whitespaces out this set.
>>> eval("\xa0")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
^
SyntaxError: invalid character in identifier
>>> eval("f'''{\xa0}'''")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
SyntaxError: f-string: empty expression not allowed
----------
components: Interpreter Core
messages: 294869
nosy: eric.smith, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Incorrect error messages for invalid whitespaces in f-string
subexpressions
type: behavior
versions: Python 3.6, Python 3.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30529>
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