Serhiy Storchaka added the comment:
But on other hand, the error depends on the value of format specifier:
>>> format('abc', '')
'abc'
>>> format('abc', 'j')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: Unknown format code 'j' for object of type 'str'
>>> format([1, 2, 3], '')
'[1, 2, 3]'
>>> format([1, 2, 3], 'j')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unsupported format string passed to list.__format__
If keep TypeError I think it would be better to restore former error message
"non-empty format string".
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28385>
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