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Python Function Classification Based on Parameters and Return Values
Last Updated : April 24, 2025
There are following types of the Python functions based on their parameters and return values:
- Function with no argument and no return value
- Function with no argument but return value
- Function with argument and no return value
- Function with arguments and return value
1) Function with no argument and no return value
These types of Python functions do not take any argument and do not return any value.
Example
def sum():
a = int(input("Enter A: "))
b = int(input("Enter B: "))
c=a+b
print("Sum :", c)
def main():
sum()
if __name__=="__main__":
main()
Output
Enter A: 10
Enter B: 20
Sum : 30
2) Function with no argument but return value
These types of Python functions do not take any argument but return a value.
Example
def sum():
a = int(input("Enter A: "))
b = int(input("Enter B: "))
c=a+b
return c
def main():
c = sum()
print("Sum :",c)
if __name__=="__main__":
main()
Output
Enter A: 10
Enter B: 20
Sum : 30
3) Function with argument and no return value
These types of Python functions have the arguments but do not return any value.
Example
def sum(a,b):
c=a+b
print("Sum :", c)
def main():
a = int(input("Enter A: "))
b = int(input("Enter B: "))
sum(a,b)
if __name__=="__main__":
main()
Output
Enter A: 10
Enter B: 20
Sum : 30
4) Function with arguments and return value
These types of Python functions have the arguments and also return a value.
Example
def sum(a,b):
c=a+b
return c
def main():
a = int(input("Enter A: "))
b = int(input("Enter B: "))
c = sum(a,b)
print("Sum :",c)
if __name__=="__main__":
main()
Output
Enter A: 10
Enter B: 20
Sum : 30
Python Function Classifications Exercise
Select the correct option to complete each statement about function classifications in Python.
- Functions that are defined inside a class are called ___.
- Functions that do not belong to a class and are defined using the def keyword are called ___.
- Functions like
len(), print(), and range() are examples of ___ functions in Python.
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