# Rational Numbers in Python

In this tutorial, we will learn how to check a number is a rational number or not in Python with some cool and easy examples.

I know, you have faced so many problems in Python to check the number is rational or not. Python Language has so many inbuilt modules so that you can ease your work.

## What is Rational Number

let’s learn:

Any number which can be expressed in the form of p/q, where p and q are integers and q is not equal to 0(i.e q!= 0), is called a **rational number**.

Examples :

- 2/5
- 4/3
- 3/1
- 2.14

### Python module for rational number

There is the inbuilt module for a rational number in Python. This module has a fraction class and two objects, shown below:

from fractions import Fraction Fraction(num, denom)

Providing value to object of Fractional class:

from fractions import Fraction rational1 = Fraction(7,2) print(rational1) rational2 = Fraction(12,4) print(rational2) rational3 = Fraction(11,3) print(rational3)

Points to remember:

- If the value of denominator = 0, it will throws ZeroDivisionError.
- After division numerator and denominator will be reduced to the shortest form.

Output: 7/2 3 11/3

The Fraction constructor also receives string parameter, if and only if contains valid numeric representation.

Examples:

from fractions import Fraction p = Fraction('1') print(p) q = Fraction('2') print(q)

Output: 1 2

There are two attributes numerator and denominator of Fraction, which a user can access independently.

rational1 = Fraction(7,2) print("numerator",rational1.numerator) print("denominator",rational1.denominator) rational2 = Fraction(12,4) print("numerator",rational2.numerator) print("denominator",rational2.denominator)

Output: numerator 7 denominator 2 numerator 3 denominator 1

In this article, we learned about the rational number in python and using of Fraction module and its various attributes. If you have any queries please comment below.

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