A program made in python that shows the longest word in a setence

longest_word_in_a_string.py

import re

filter_regex = re.compile('[^a-zA-Z\s]+')

def string_filter(word):
  '''(str) > str

  Remove marks from a string

  >>> string_filter('hi!')
  hi
  >>> string_filter('hey! how are you doing, Mark?')
  hey how are you doing Mark
  '''
  return filter_regex.sub('', word)

def longest_word(sentence):
  '''(str) > int

  Returns the longest word in a <string></string>

  >>>longest_word(did you know what parangaricutirimicuaro means?)
  parangaricutirimicuaro
  >>>longest_word(I like cake and potato)
  potato
  '''

  words = string_filter(sentence).split()
  max_letter = 0

  for word in words:
    max_letter = max(len(word), max_letter)

  for word in words:
    if max_letter == len(word):
      return word

def print_longest_word(sentence):
  print('\nthe longest word in the setence\n"'+sentence+'" is:\n', longest_word(sentence))

#parangaricutirimicuaro is the longest word
print_longest_word("did you know what parangaricutirimicuaro means?")

#potato is the longest word
print_longest_word("I like cake and potato!")