Eric V. Smith <e...@trueblade.com> added the comment:
Changing the title to reflect the real problem.
You get a SystemError even when using a mapping, if you have a format string
with positional arguments:
>>> '{}'.format_map({'a':0})
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
SystemError: null argument to internal routine
----------
title: str.format_map raises a SystemError for non-mapping -> str.format_map
raises a SystemError for format strings with positional arguments
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12579>
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