# Return Statement In Python

## Overview:

• return is a keyword in Python
• return statement in Python immediately returns control to the next enclosing function.

## List of Contexts the return statement is used in Python:

• To return a value from the happy path of the function.
• To return without a value from the happy path of the function.
• To return from special cases of logic(opposite to the happy path or a labyrinth of  several happy cases) from a function.
• In a nutshell, to return from any scope of a function, returning with or without a value.
• If the return is from an enclosing try block with an associated finally block, the code inside the finally block is executed before the return.

Picture showing multiple exit gates - or return paths for the occupants. Photo:Thomas Kamann

• If return is invoked without an expression argument to it, the value None is returned.
• If there is no return statement specified at the end of a function the value returned is None.

## Example1:

To return a value from the happy path of the function

 import math   def CircleCircumference(radius):     circumference = 2*math.pi*radius     return circumference   radius = 5 print("Circumference of a circle with radius %f is %f"%(radius, CircleCircumference(radius)));

## Output1:

 Circumference of a circle with radius 5.000000 is 31.415927

## Example 2:

 def printHeader():     print("");     print("");     print("Exercise on return statement in Python            Programming Language");     print("");     print("");   printHeader();

## Example 3:

• This example handles multiple Happy paths and a couple of refined cases. “Whether the year value divides by four without any remainder or not” form two happy paths.

• Also there are more rare cases to be handled like events that can happen only once in 100 years or once in 400 years.

• In such cases as well returning a valid value is needed to make the function defect-free.

 def isLeapYear(year):       if (year % 400 == 0):        # Happens only once in 400 years         return True;       elif (year % 100 == 0):      # Happens only once in 100 years         return False;       elif (year % 4 == 0):         return True;             # Happy Path1       return False;                # Happy Path2                           yearVal         = 2400  leapTest        = isLeapYear(yearVal)   outputString    =  "" if leapTest :     outputString = "%d is a leap year"%(yearVal) else:     outputString = "%d is not a leap year"%(yearVal)   print(outputString)