[issue28827] f-strings: format spec should not accept unicode escapes

[Eric V. Smith]

Eric V. Smith added the comment:

Specifically, see: https://www.python.org/dev/peps/pep-0498/#format-specifiers

str.format() also works this way:
>>> '{0:02{1}}'.format(10, an_x)
'0A'

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<http://bugs.python.org/issue28827>
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