[docs] [issue9780] fill character cannot be '{'

[Florent Xicluna]

New submission from Florent Xicluna <florent.xicluna at gmail.com>:

According to the documentation:
"The fill character can be any character other than ‘}’ (which signifies the end of the field)."
http://docs.python.org/dev/library/string.html#format-specification-mini-language


However the format() builtin accepts both '{' and '}' characters:

>>> format(42, '}^6')
'}}42}}'

>>> format(42, '{^6')
'{{42{{'


And the string method rejects both characters.

>>> '{:}^6}'.format(42)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: Single '}' encountered in format string

>>> '{:{^6}'.format(42)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: unmatched '{' in format

----------
assignee: docs at python
components: Documentation
messages: 115678
nosy: docs at python, flox
priority: normal
severity: normal
stage: needs patch
status: open
title: fill character cannot be '{'
type: behavior
versions: Python 2.7, Python 3.1, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9780>
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