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Types of Functions in Python

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In real time, a function may be defined with or without parameters, and a function may or may not return a value. It is completely depends upon the user requirement. In this article, We will explain you the types of functions in Python Programming language with example.

In Python programming, As per our requirement, We can define the User defined functions in multiple ways

  1. Function with no argument and no Return value
  2. Function with no argument and with Return value
  3. Function with argument and No Return value
  4. Function with argument and Return value

NOTE:

  • From the above, 1 and 3 types does not return any value when the function is called so, while defining the function, we can avoid return keyword.
  • When we call the 2 and 4 type functions, they will return some value so, We have to use the return keyword.

Types of Functions in Python

The Following examples will explain you the list of functions that are available in Python programming.

Function with No argument and No Return value

In this method, While defining, declaring or calling the function, We won’t pass any arguments to the function. This type of functions will not return any value when we call the function. Whenever we are not expecting any return value, we might need some statements to be printed as output. In such a scenario, we can use this type of functions.

Function with No argument and No Return value Example

In this program, We are going to calculate the Sum of 2 integer values and print the output from the user defined function itself.

PYTHON CODE

# Python Function with No Arguments, and No Return Value
def Adding():
    a = 20
    b = 30
    Sum = a + b
    print("After Calling the Function:", Sum)
Adding()

OUTPUT

Types of Functions in Python programming 1

ANALYSIS

If you observe the Addition() function, We haven’t passed any arguments /parameters to the function Addition()

We declared the integer variables a, b and assigned 20 to a and 30 to b.

In the next line we calculate the sum using Arithmetic operator ( + )

    a = 20
    b = 30
    Sum = a + b

Below print statement is used to print the output.

print("After Calling the Function:", Sum)

Whenever we call the Adding() function, it will print the same output because the values of a and b are fixed inside the function.

Function with no argument and with Return value

In this method, We won’t pass any arguments to the function while defining, declaring or calling the function. When we call the function, this type of functions will return some value.

Function with No arguments and with Return value Example

In this program, We are going to calculate the multiplication of 2 integer values using the user defined function without arguments and return keyword.

PYTHON CODE

# Python Function with No Arguments, and with Return Value
def Multiplication():
    a = 10
    b = 25
    Multi = a * b
    return Multi
print("After Calling the Multiplication Function: ", Multiplication())

OUTPUT

Types of Functions in Python programming 2

ANALYSIS

Within the Multiplication () function, We haven’t passed any arguments /parameters. Next, We declared the integer variables of Multi, a, b and we assigned 10 to a, and 25 to b.

In the next line we Multiplied both a and b using Arithmetic operator ( * )

a = 10
b = 25
Multi = a * b

Lastly, print statement is used to print the output. Remember, we are using the print statement outside the defined function, and we are using the function name inside the print statement. (nothing but calling the function)

print("After Calling the Multiplication Function: ", Multiplication())

Here also, Whenever we call the Multiplication() function, it will print the same output because the values of a and b are fixed inside the function.

Function with argument and No Return value

If you observe the above 2 methods, No matter how many times you executive, it will give the same output. We don’t have any control over the variable values (a, b) because they are fixed values. In real-time, we mostly deal with dynamic data means we have to allow the user to enter his own values rather than fixed ones.

This method allows us to pass the arguments to the function while calling the function. But, This type of functions will not return any value when we call the function.

Function with argument and No Return value Example

This program allows the user to enter 2 integer values and then, We are going to pass those values to the user defined function to Multiply them.

PYTHON CODE

# Python Function with Arguments, and NO Return Value
def Multiplications(a, b):
    Multi = a * b
    print("After Calling the Function:", Multi)

Multiplications(10, 20)

OUTPUT

Types of Functions in Python programming 3

ANALYSIS

Within the Multiplication(a, b) function, We declared the variables of Multi and also we also had (a, b) arguments in the function. This means, this function will allow the user to pass 2 values.

In the next line we added both a and b using Arithmetic operator ( * )

Multi = a * b

In the next line, print statement is used to print the output

print("After Calling the Function:", Multi)

As you can see from the above output, we called the Multiplication function with different values, and it is giving the output as per the values.

Function with argument and Return value

This method allows us to pass the arguments to the function while calling the function. This type of functions will return some value when we call the function. This type of user defined functions are called as fully dynamic function means, it provide maximum control to the end-user.

Function with arguments and Return value Example

This program allows the user to enter 2 integer values and then, We are going to pass those values to the user defined function to add those values and return the value using return keyword.

PYTHON CODE

# Python Function with Arguments, and NO Return Value
def Addition(a, b):
    Sum = a + b
    return Sum
# We are calling the Function Outside the Function Definition
print("After Calling the Function:", Addition(25, 45))

OUTPUT

Types of Functions in Python programming 4

ANALYSIS

Within the Addition(a, b) function, We declared the variables of Sum and also we also had (a, b) arguments in the function. This means, this function will allow the user to pass 2 values.

In the next line we added both a and b using Arithmetic operator ( * )

Multi = a * b

In the next line, print statement is used to print the output

print("After Calling the Function:", Multi)

As you can see from the above output, we called the addition function with different values, and it is giving the output as per the values.

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