怎样写一个拼写检查器，拼写检查器,Screenshot-1

怎样写一个拼写检查器，拼写检查器,Screenshot-1

Screenshot-1.png

imgs/asCode/23201500_dlVT.png

spell.py

#!/usr/bin/pythonimport re, collectionsdef words(text):    return re.findall('[a-z]+', text.lower())def train(features):    model = collections.defaultdict(lambda: 1)    for f in features:        model[f] += 1    return modelNWORDS = train(words(file('big.txt').read()))alphabet = 'abcdefghijklmnopqrstxyz'def edist1(word):    n = len(word)    return set([word[0:i]+word[i+1: ] for i in range(n)] +                      #deletion               [word[0:i]+word[i+1]+word[i]+word[i+2: ] for i in range(n-1)] +  #transposition               [word[0:i]+c+word[i+1: ] for i in range(n) for c in alphabet] +  #alteration               [word[0:i]+c+word[i: ] for i in range(n+1) for c in alphabet])   #insertiondef known_edist2(word):    return set(e2 for e1 in edist1(word) for e2 in edist1(e1) if e2 in NWORDS)def known(words):    return set(w for w in words if w in NWORDS)def correct(word):    candidates = known([word]) or known(edist1(word)) or known_edist2(word) or [word]    return max(candidates, key=lambda w:NWORDS[w])print('thew => ' + correct('thew'))print('spak => ' + correct('spak'))print('goof => ' + correct('goof'))print('babyu => ' + correct('babyu'))print('spalling => ' + correct('spalling'))