Expanding contractions

gistfile1.txt

contractions_dict = { "ain’t": "are not", "’s":" is", "aren’t": "are not", "can’t": "cannot", "can’t’ve": "cannot have", "‘cause": "because", 
                     "could’ve": "could have", "couldn’t": "could not", "couldn’t’ve": "could not have", "didn’t": "did not", "doesn’t": "does not", 
                     "don’t": "do not", "hadn’t": "had not", "hadn’t’ve": "had not have", "hasn’t": "has not", "haven’t": "have not", "he’d": "he would", 
                     "he’d’ve": "he would have", "he’ll": "he will", "he’ll’ve": "he will have", "how’d": "how did", "how’d’y": "how do you", "how’ll": "how will",
                     "I’d": "I would", "I’d’ve": "I would have", "I’ll": "I will", "I’ll’ve": "I will have", "I’m": "I am", "I’ve": "I have", "isn’t": "is not", 
                     "it’d": "it would", "it’d’ve": "it would have", "it’ll": "it will", "it’ll’ve": "it will have", "let’s": "let us", "ma’am": "madam", 
                     "mayn’t": "may not", "might’ve": "might have", "mightn’t": "might not", "mightn’t’ve": "might not have", "must’ve": "must have", 
                     "mustn’t": "must not", "mustn’t’ve": "must not have", "needn’t": "need not", "needn’t’ve": "need not have", "o’clock": "of the clock", 
                     "oughtn’t": "ought not", "oughtn’t’ve": "ought not have", "shan’t": "shall not", "sha’n’t": "shall not", "shan’t’ve": "shall not have", 
                     "she’d": "she would", "she’d’ve": "she would have", "she’ll": "she will", "she’ll’ve": "she will have", "should’ve": "should have", 
                     "shouldn’t": "should not", "shouldn’t’ve": "should not have", "so’ve": "so have", "that’d": "that would", "that’d’ve": "that would have", 
                     "there’d": "there would", "there’d’ve": "there would have", "they’d": "they would", "they’d’ve": "they would have","they’ll": "they will",
                     "they’ll’ve": "they will have", "they’re": "they are", "they’ve": "they have", "to’ve": "to have", "wasn’t": "was not", "we’d": "we would",
                     "we’d’ve": "we would have", "we’ll": "we will", "we’ll’ve": "we will have", "we’re": "we are", "we’ve": "we have", "weren’t": "were not",
                     "what’ll": "what will", "what’ll’ve": "what will have", "what’re": "what are", "what’ve": "what have", "when’ve": "when have", 
                     "where’d": "where did", "where’ve": "where have", "who’ll": "who will", "who’ll’ve": "who will have", "who’ve": "who have", 
                     "why’ve": "why have", "will’ve": "will have", "won’t": "will not", "won’t’ve": "will not have", "would’ve": "would have", 
                     "wouldn’t": "would not", "wouldn’t’ve": "would not have", "y’all": "you all", "y’all’d": "you all would", "y’all’d’ve": "you all would have", 
                     "y’all’re": "you all are", "y’all’ve": "you all have", "you’d": "you would", "you’d’ve": "you would have", "you’ll": "you will", 
                     "you’ll’ve": "you will have", "you’re": "you are", "you’ve": "you have"}

sentence = "It would be unfair to demand that people cease pirating files when those same people aren't paid for their participation in very lucrative \
network schemes. Ordinary people are relentlessly spied on, and not compensated for information taken from them. While I'd like to see everyone eventually \
pay for music and the like, I'd not ask for it until there's reciprocity."

import re

contractions_re = re.compile('(%s)'%'|'.join(contractions_dict.keys()))

def expand_contractions(s, contractions_dict=contractions_dict):
    def replace(match):
        return contractions_dict[match.group(0)]
    return contractions_re.sub(replace, s)

sentence = expand_contractions(sentence)
print(sentence)
# It would be unfair to demand that people cease pirating files when those same people aren't paid for their participation in very lucrative network schemes. 
# Ordinary people are relentlessly spied on, and not compensated for information taken from them. While I'd like to see everyone eventually pay for music and the like, I'd not ask for it until there's reciprocity.