Partial functions allow us to fix a certain number of arguments of a function and generate a new function.
Example:
python - Sample - python code :
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))click below button to copy the code. By Python tutorial team
Output:
3145In 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 :
python - Sample - python code :
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))click below button to copy the code. By Python tutorial team
Output:
python - Sample - python code :
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++.