R. David Murray added the comment:
OK, I didn't even realize that was possible with partial. Now I understand
Yuri's original point. His example is wrong:
>>> def foo(a, b):
... print(a, b)
>>> x2 = partial(foo, 'x')
>>> str(inspect.signature(x2))
'(b)'
This is the correct example:
>>> x = partial(foo, a='x')
>>> x('b')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: foo() got multiple values for argument 'a'
The current signature for this is the one Yuri gave:
>>> str(inspect.signature(x))
"(a='x', b)"
Which is about as close as one can come to the rather non-intuitve
(non-pythonic?) behavior that partial has here. Perhaps this a bug in partial?
If so it is unfortunately one with ugly backward compatibility implications.
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<http://bugs.python.org/issue21117>
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