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?
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Search for "partial application".Hyperboreus– Hyperboreus2013-02-21 04:20:06 +00:00Commented Feb 21, 2013 at 4:20
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2 Answers
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.
Comments
Lambda is easiest, but you could also use functools.partial for more complex cases:
import functools
bar(functools.partial(foo, B=300))
