import itertools
[docs]def partial(func, *args, **keywords):
"""
A version of functools.partial that allows specifying positional arguments out of order using ellipses.
See: https://stackoverflow.com/a/11173903
Examples:
>>> print partial(pow, ..., 2, 3)(5) # (5^2)%3
1
>>> print partial(pow, 2, ..., 3)(5) # (2^5)%3
2
>>> print partial(pow, 2, 3, ...)(5) # (2^3)%5
3
>>> print partial(pow, 2, 3)(5) # (2^3)%5
3
"""
def newfunc(*fargs, **fkeywords):
newkeywords = keywords.copy()
newkeywords.update(fkeywords)
return func(*(newfunc.leftmost_args + fargs + newfunc.rightmost_args), **newkeywords)
newfunc.func = func
args = iter(args)
newfunc.leftmost_args = tuple(itertools.takewhile(lambda v: v != Ellipsis, args))
newfunc.rightmost_args = tuple(args)
newfunc.keywords = keywords
return newfunc