CODEWITHSUNDEEP
pythonfunction
Paul S.
Paul S.

Reputation: 4502

pass function to function with different number of variables

Suppose I have a function def foo(A, B).

Now I have another function bar(func), where func is a function that takes only one variable. I want to pass in foo as func, but with the second variable B always fixed to 300. How can I do that?

Upvotes: 1

Views: 74

Answers (2)

rmmh
rmmh

Reputation: 7095

Lambda is easiest, but you could also use functools.partial for more complex cases:

import functools

bar(functools.partial(foo, B=300))

Upvotes: 2

mgilson
mgilson

Reputation: 310117

You use lambda:

bar(lambda x: foo(x,300))

basically, 

func = lambda x: x*x

is more or less equivalent to:

def func(x):
   return x*x

So in this case, we use something that's more or less equivalent to:

def new_func(x):
    return foo(x,300)

and then we pass the equivalent of new_func to bar.

Upvotes: 3

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