## What is a modulo operator (%) in Python?

When we see a ‘%’ the first thing that comes to our mind is the “Percentage-sign”, but when we think of it from the perspective of computer language, this sign has, in fact, another name and meaning. In computing, the **modulo operation**(%) finds the **remainder** or **signed remainder** after the division of one number by another (called the modulus of the operation).

Given two positive numbers, a and n, a modulo n (a % n, abbreviated as a **mod** n) is the remainder of the **Euclidean division** of a by n, where a is the dividend and n is the divisor.

Basically, Python modulo operation is used to get the remainder of a division. The modulo operator(**%**) is considered an arithmetic operation, along with **+**, **–**, **/**, *****, ******, **//**. In most languages, both operands of this modulo operator have to be an integer. But Python Modulo is versatile in this case. The operands can be either **integer** or **float**.

**Syntax:**

a%b

Here, a is divided by b, and the remainder of that division is returned.

**Code:**

- Python3

`# inputs` `a ` `=` `13` `b ` `=` `5` ` ` `# Stores the remainder obtained ` `# when dividing a by b, in c` `c ` `=` `a ` `%` `b ` `print` `(a, ` `"mod"` `, b, ` `"="` `,` ` ` `c, sep ` `=` `" "` `)` ` ` `# inputs` `d ` `=` `15.0` `e ` `=` `7.0` ` ` `# Stores the remainder obtained ` `# when dividing d by e, in f` `f ` `=` `d ` `%` `e` `print` `(d, ` `"mod"` `, e, ` `"="` `, ` ` ` `f, sep ` `=` `" "` `)` |

**Output:**

13 mod 5 = 3 15.0 mod 7.0 = 1.0

This was a simple example showing the use of the syntax, and a basic operation performed by the modulo operator. Suppose, we want to calculate the remainder of every number from 1 to n when divided by a fixed number k.

- Python3

`# function is defined for finding out ` `# the remainder of every number from 1 to n` `def` `findRemainder(n, k):` ` ` ` ` `for` `i ` `in` `range` `(` `1` `, n ` `+` `1` `):` ` ` `# rem will store the remainder ` ` ` `# when i is divided by k.` ` ` `rem ` `=` `i ` `%` `k ` ` ` ` ` `print` `(i, ` `"mod"` `, k, ` `"="` `, ` ` ` `rem, sep ` `=` `" "` `)` ` ` `# Driver code` `if` `__name__ ` `=` `=` `"__main__"` `:` ` ` ` ` `# inputs` ` ` `n ` `=` `5` ` ` `k ` `=` `3` ` ` ` ` `# function calling` ` ` `findRemainder(n, k)` |

**Output:**

1 mod 3 = 1 2 mod 3 = 2 3 mod 3 = 0 4 mod 3 = 1 5 mod 3 = 2

## Exceptions

The only Exception you get with python modulo operation is **ZeroDivisionError**. This happens if the divider operand of the modulo operator becomes **zero**. That means the **right operand can’t be zero**. Let’s see the following code to know about this python exception.

- Python3

`# inputs` `a ` `=` `14` `b ` `=` `0` ` ` `# exception handling` `try` `:` ` ` `print` `(a, ` `'mod'` `, b, ` `'='` `,` ` ` `a ` `%` `b, sep ` `=` `" "` `)` ` ` `except` `ZeroDivisionError as err:` ` ` `print` `(` `'Cannot divide by zero!'` `+` ` ` `'Change the value of the right operand.'` `)` |

**Output:**

Cannot divide by zero! Change the value of the right operand.

Last Updated on November 13, 2021 by admin