mulitple_replacements.py

import re

#the extended version
def multiple_replace(dict, text):
  # Create a regular expression  from the dictionary keys
  regex = re.compile("(%s)" % "|".join(map(re.escape, dict.keys())))

  # For each match, look-up corresponding value in dictionary
  return regex.sub(lambda mo: dict[mo.string[mo.start():mo.end()]], text) 


#the short version
multi_replace = lambda dict, text: re.sub(r"|".join(map(re.escape, dict.keys())), lambda m: dict[m.string[m.start():m.end()]], text)


print(multi_replace({"ahmed":"no one", "good":"good enough."}, "ahmed is good"))