Python how to only accept numbers as a input

Question

mark= eval(raw_input(\"What is your mark?\"))
try:
    int(mark)
except ValueError:
    try:
        float(mark)
    except ValueError:
        print \"This is not a         


        

Answer 1

import re

pattern = re.compile("^[0-9][0-9]\*\\.?[0-9]*")

status = re.search(pattern, raw_input("Enter the Mark : "))

if not status:

        print "Invalid Input"