[issue12579] str.format_map raises a SystemError for format strings with positional arguments

[Eric V. Smith]

Eric V. Smith <eric at 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

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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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<http://bugs.python.org/issue12579>
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