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Python | Check if the given string is numeric or not

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Examples :

`  Input:  28  Output:  digit  Input:  a  Output:  not a digit.  Input:  21ab  Output:  not a digit. `

Code # 1: Using Python Regular Expressions

re.search (): This method either returns None (if the pattern does not match), or re.MatchObject, which contains information about the corresponding part of the string. This method stops after the first match, so it’s better for checking regular expressions than for extracting data.

 ` # Python program for identifying a digit `   ` # import re module `   ` # re module provides support ` ` # for regular expressions ` ` import ` ` re `   ` # Make a regular expression ` ` # to identify a digit ` ` regex ` ` = ` ` ’^ [0-9] + \$’ `   ` # Define a function for ` ` # digit identification ` ` def ` ` check (string): `   ` # pass regex ` ` # and a line in the search () method ` ` ` ` if ` ` (re.search (regex, string)): ` ` print ` ` (` ` "Digit" ` `) `   ` else ` `: ` ` prin t ` ` (` ` "Not a Digit" ` `) `     ` Driver code ` ` if ` ` __ name__ ` ` = ` ` = ` ` ’__main__’ ` `: `   ` # Enter a string ` ` string ` ` = ` `" 28 "` ` `  ` ` ` # call the run function ` ` check (string) ` ` `  ` ` ` string ` ` = ` ` "a" ` ` check (string) `   ` string ` ` = ` ` "21ab" ` ` check (string) `   ` string ` ` = ` ` "12ab12" ` ` check (string) `

Exit :

` Digit Not a Digit Not a Digit Not a Digit `

Code # 2: Using the string.isnumeric ()

` `

` # Python code to check is whether the string is numeric or not   # checking numeric characters string = ’123ayu456’ print (string.isnumeric ())    string = ’ 123456’ print (string.isnumeric ())  `

` ` Exit:

` False True `

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