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 functiondef 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:
3145
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 functiondef add(a, b, c): return 100 * a + 10 * b + c # A partial function with b = 1 and c = 2add_part = partial(add, c = 2, b = 1) # Calling partial functionprint(add_part(3)) |
Output:
312
- 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++.
Last Updated on November 13, 2021 by admin