Check If a String is a Number Python

There are various methods to check if a string is a number or not in Python here we are discussing some generally used methods for check if string is a number in Python those are the following.

• Using isdigit() method
• Using Regular Expressions (re.match)
• Using isnumeric() method
• Using Python Regex 
• Without any built-in methods
• Using the “try” and “float” functions
• Using “try” and “expect” block
• Using a Custom Function
• Using ASCII Values

In Python, there are different situations where we need to determine whether a given string is valid or not. Given a string, the task is to develop a Python program to check whether the string represents a valid number.

Example

Input:  95
Output: Digit
 
Input: a
Output: not a digit