python tutorial - Python Partial | Partial Functions in Python - learn python - python programming




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))
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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 :

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))
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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++.

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