Passing a function to re.sub in Python

Question

I have strings that contain a number somewhere in them and I\'m trying to replace this number with their word notation (ie. 3 -> three). I have a function that does this. Th

Answer 1

A solution without lambda

import re

def convert_func(matchobj):
    m =  matchobj.group(0)
    map = {'7': 'seven',
           '8': 'eight',
           '9': 'nine'}
    return map[m]

line = "7 ate 9"
new_line =  re.sub("[7-9]", convert_func, line)