Modulo in Python

From Computer Science Wiki
This is basic programming knowledge [1]

Introduction[edit]

The % (modulo) operator yields the remainder from the division of the first argument by the second. The numeric arguments are first converted to a common type. A zero right argument raises the ZeroDivisionError exception. The arguments may be floating point numbers, e.g., 3.14%0.7 equals 0.34 (since 3.14 equals 4*0.7 + 0.34.) The modulo operator always yields a result with the same sign as its second operand (or zero); the absolute value of the result is strictly smaller than the absolute value of the second operand [2]

We most often use modulo to test if a number is odd, even, or something like that.

Example of modulo in Python[edit]

# this code sample will help us understand how to use modulo in Python

# our first function asks "is this number divisble by 2?". If it isn't, it must be odd. 

def is_it_odd(number):
    if number % 2 == 0:
        print("is even")
    else:    
        print("is odd")
    return     

is_it_odd(1)
is_it_odd(2)   
is_it_odd(3)   
is_it_odd(4)


Another example:

# this code sample will help us understand how to use modulo in Python

# Another example might be to see if a number is divisible by 25

def is_it_divisible_by_25(number):
    if number % 25 == 0:
        print("is divisble by 25")
    else:    
        print("is not divisble by 25")
    return     

is_it_divisible_by_25(125)
is_it_divisible_by_25(275)   
is_it_divisible_by_25(300)   
is_it_divisible_by_25(431)
is_it_divisible_by_25(25)
is_it_divisible_by_25(305)

Other ways to understand this[edit]

Click here for a video - this is a basic example

References[edit]

anomalous or exceptional conditions requiring special processing – often changing the normal flow of program execution

A unit of abstract mathematical system subject to the laws of arithmetic.