functools.partial(func[,*args][, **keywords])

• Return a new partial object which when called will behave like func called with the positional arguments args and keyword arguments keywords. 

For example, partial() can be used to create a callable that behaves like the int() function where the base argument defaults to two:

>>> from functools import partial
>>> basetwo = partial(int, base=2)
>>> basetwo.__doc__ = 'Convert base 2 string to an int.'
>>> basetwo('10010')
18

https://docs.python.org/2/library/functools.html?highlight=functools%20partial#functools.partial