User Defined Functions

Functions are organized reusable code block, which can be called whenever we required in our program. It helps to chunk our large program into smaller code blocks and provides greater re-usability

User defined function

These functions creates by user for perform customized task. Below are the major types of ways, we can create a user defined functions in python

Function Creation without Arguments

def keyword helps to create functions in python

#Function definition
def add():
    value1 = 10
    value2 = 30
    sum = value1 + value2
    print(sum)

#Function Calling 
add()

#Function can call how many times we required
add()

Output

40
40

Function Creation with Arguments

Arguments helps to pass the values to the functions dynamically

#Function definition
def add(num1, num2):
    value1 = num1
    value2 = num2
    sum = value1 + value2
    print(sum)

#Function Calling 
add(10, 20)

#Function calling with different parameter values
add(50, 100)

Output

30
150

Function Creation with return values

Return keywords helps to return the required value from a function

#Function definition
def add(num1, num2):
    value1 = num1
    value2 = num2
    sum = value1 + value2
    return sum

#Function Calling 
result = add(10, 20)
print(result)

#Function calling with different parameter values
result = add(50, 100)
print(result)

Output

30
150