Return values

A function can accept input values, as well as returning a value to the code that calls this function. Here is an example:

def square(x):
    return x**2

Call square on integer 3 to get the square of 3

print( square(3) )      # 9
print( square(4) )      # 16

Use square(x) to write another function:

def sum_of_square(a,b):
    sum = square(a) + square(b)
    return sum

Now it's easy to calculate (3*3 + 4*4)

print( sum_of_square(3, 4) )    # result: 25

Note about return statement

• Any value provided to the return statement is passed back to your calling code.
• If a function does not have a return statement, then it returns the value None.