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.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

My Personal Notes

Suggest a Topic

Recommended Posts: