Python Is Integer

Python Is Integer

This notebook explains how to check in Python if a number is a integer.

There are multiple ways to check for integer in Python 2 and Python 3.

1. isinstance() method
2. is_integer() method
3. type() method
4. try except method

Python isinstance

Python 3 isinstance() Examples

Example1

In [2]:

isinstance(5,int)

Out[2]:

True

Example2

In [3]:

isinstance(5.5,int)

Out[3]:

False

Example3

In [4]:

isinstance('hello',int)

Out[4]:

False

Python 2 isinstance() Examples

Python 2 has two integer data types - int and long.

Example1

In [7]:

isinstance(long(5),(long))

Out[7]:

True

In [8]:

isinstance(5,long)

Out[8]:

False

In [9]:

isinstance(5,int)

Out[9]:

True

is_integer Python

is_integer is similar in both Python 2 and Python 3.

is_integer Python is for float numbers. It checks whether a float number is an integer.

Example1

In [6]:

x = 5.5
x.is_integer()

Out[6]:

False

However is_integer() can be used for integers if we first convert integer to float as shown in example 2.

Example2

In [7]:

x = 5
float(x).is_integer()

Out[7]:

True

Note: You can't use float(x).is_integer() standalone. You will need

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