how to remove misspelled words in nltk

1def edits1(word):
2   splits     = [(word[:i], word[i:]) for i in range(len(word) + 1)]
3   deletes    = [a + b[1:] for a, b in splits if b]
4   transposes = [a + b[1] + b[0] + b[2:] for a, b in splits if len(b)>1]
5   replaces   = [a + c + b[1:] for a, b in splits for c in alphabet if b]
6   inserts    = [a + c + b     for a, b in splits for c in alphabet]
7   return set(deletes + transposes + replaces + inserts)
8