char=input('enter character:')
if '0'<=char<='9':
    print(char,'is digit')
else:
    print(char,'is not digit')
    
(OR)
    
char=input('enter character:')
if 48<=ord(char)<=57:
    print(char,'is digit')
else:
    print(char,'is not digit')

(OR)

char=input('enter character:')
if char.isdigit():  # isdigit() is a method to find digit or not it returns true and false
    print(char,'is digit')
else:
    print(char,'is not digit')