[docs] [issue13790] In str.format an incorrect error message for list, tuple, dict, set

[py.user]

py.user added the comment:

Python 2.7.7 is still printing.

>>> format([], 'd')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: Unknown format code 'd' for object of type 'str'
>>>

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13790>
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