Serhiy Storchaka added the comment:
It matches error messages generated by builtin unbound methods.
>>> str.format()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: descriptor 'format' of 'str' object needs an argument
It would be incorrect to say "substitute method wants x y z", because the
substitute method doesn't need any arguments.
>>> string.Template('spam').substitute()
'spam'
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<http://bugs.python.org/issue23671>
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