How to determine whether a variable is an integer in Python

Python method to determine whether a variable is an integer: 1. Use the function [type()] function to directly return the variable type; 2. Use the [isinstance()] function to determine the type of the variable and return is a boolean value.

The operating environment of this tutorial: Windows 7 system, python version 3.9, DELL G3 computer.

Python's method to determine whether a variable is an integer:

Python has two ways to check the variable type: type()The function can return directly Variable type; isinstance() The function can be used to determine the type of the variable and returns a Boolean value.

isinstance() function

can be used to determine the type of a variable. It returns a Boolean value, False or True.

>>>isinstance("123",str)
>>>Flase
>>>isinstance(123,int)
>>>True
>>>isinstance({'123'},list)
>>>False
>>>isinstance(['123'],int)
>>>False

Like Int, float, etc. are all basic variable types. In fact, class is also a variable type.

type() function

does not determine the type of the variable, but directly returns the type of the variable

>>> type(123)
<class &#39;int&#39;>

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