# 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)