how to check string is number in python code example

Example 1: python test if string is int

'16'.isdigit()
>>>True

'3.14'.isdigit()
>>>False

'Some text'.isdigit()
>>>False

Example 2: python check if number

if type(variable) == int or type(variable) == float:
    isNumber = True

Example 3: is number python

var.isdigit()
#return true if all the chars in the string are numbers
#return false if not all the chars in the string are numbers