# 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 :

1. 2/5
2. 4/3
3. 3/1
4. 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:

1. If the value of denominator = 0, it will throws ZeroDivisionError.
2. 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.