Partial Functions in Python

Partial functions allow us to fix a certain number of arguments of a function and generate a new function.

Example:

from functools import partial 
  
# A normal function 
def f(a, b, c, x): 
    return 1000*a + 100*b + 10*c + x 
  
# A partial function that calls f with 
# a as 3, b as 1 and c as 4. 
g = partial(f, 3, 1, 4) 
  
# Calling g() 
print(g(5)) 

Output:

In the example we have pre-filled our function with some constant values of a, b and c. And g() just takes a single argument i.e. the variable x.

Another Example :

from functools import *
  
# A normal function 
def add(a, b, c): 
    return 100 * a + 10 * b + c 
  
# A partial function with b = 1 and c = 2 
add_part = partial(add, c = 2, b = 1) 
  
# Calling partial function 
print(add_part(3)) 

Output:

Partial functions can be used to derive specialized functions from general functions and therefore help us to reuse our code.
This feature is similar to bind in C++.

This article is contributed by Mayank Rawat .If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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