Assign Function to a Variable in Python

In this article, we are going to see how to assign a function to a variable in Python. In Python, we can assign a function to a variable. And using that variable we can call the function as many as times we want. Thereby, increasing code reusability. 

Implementation

Simply assign a function to the desired variable but without () i.e. just with the name of the function. If the variable is assigned with function along with the brackets (), None will be returned.

Syntax:

def func():
{
..
}

var=func

var()
var()

Example:

Python3

def a():
  print("GFG")

# assigning function to a variable
var=a

# calling the variable
var()

Output:

GFG

The following programs will help you understand better:

Example 1: 

Python3

# defined function
x = 123

def sum():
    x = 98
    print(x)
    print(globals()['x'])


# drivercode
print(x)

# assigning function
z = sum

# invoke function
z()
z()

Output:

123
98
123
98
123

Example 2: parameterized function

Python3

# function defined
def even_num(a):
    if a % 2 == 0:
        print("even number")
    else:
        print("odd number")


# drivercode
# assigning function
z = even_num

# invoke function with argument
z(67)
z(10)
z(7)

Output:

odd number
even number
odd number

Example 3:

Python3

# function defined
def multiply_num(a):
    b = 40
    r = a*b
    return r


# drivercode
# assigning function
z = multiply_num

# invoke function
print(z(6))
print(z(10))
print(z(100))

Output:

240
400
4000