list of functions not work as intended in python 3 -

this dive python: has 2 parts: 1st part: file called plural-rules.txt:

'[sxz]$'    '$'  'es' '[^aeioudgkprt]h$'   '$'     'es'    '[^aeiou]y$'    'y$'     'ies' '$'  '$'     's' 

second a.py:

def build_match_and_apply_functions(pattern, search, replace):     def matches_rule(word):         return re.search(pattern, word)     def apply_rule(word):         return re.sub(search, replace, word)     return (matches_rule, apply_rule) rules=[]  open('plural-rules.txt') pattern_file:     line in pattern_file:         pattern,search, replace=line.split(none, 3)                #print(pattern, search, replace)         #print(line,end='')         rules.append(build_match_and_apply_functions(pattern, search, replace)) def plural(word):     matches, plurals in rules:         if matches(word):             return plurals(word) print(rules[2][1]('shobby'))   ---------------------1 print("shobby's plural is", plural('shobby'))----------------------2 

1 print out: shobby 2 print out: shobby's plural none

you need remove 's surround tokens. this:

rules.append(build_match_and_apply_functions(pattern.strip("'"), search.strip("'"), replace.strip("'"))) 

or build input file this:

[sxz]$            $   es [^aeioudgkprt]h$  $   es    [^aeiou]y$        y$  ies $                 $   s