Serhiy Storchaka added the comment: I think the current behavior is useful, but undocumented. Otherwise a blank line starting with unmatched whitespaces (e.g. " foo\n\t\n bar") would block deindenting.
This also matches the behavior of Python parser which ignores all whitespaces
in blank lines.
>>> exec('if 1:\n\tpass\n pass\n')
>>>
>>>
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 3
pass
^
IndentationError: unindent does not match any outer indentation level
>>> exec('if 1:\n\t\n pass\n')
>>>
>>>
>>>
Added Antoine and Nick as yet two experts of the textwrap module.
----------
nosy: +ncoghlan, pitrou, serhiy.storchaka
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30754>
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