Python统计词频的几种方法小结

 def word_count1(words,n):
    word_list = []
    for word in set(words):
        num = words.counts(word)
        word_list.append([word,num])
        word_list.sort(key=lambda x:x[1], reverse=True)
    for i in range(n):
        word, count = word_list[i]
        print('{0:<15}{1:>5}'.format(word, count))

def word_count2(words,n):
    counts = {}
    for word in words:
        if len(word) == 1:
            continue
        else:
            counts[word] = counts.get(word, 0) + 1
    items = list(counts.items())
    items.sort(key=lambda x:x[1], reverse=True)
    for i in range(n):
        word, count = items[i]
        print("{0:<15}{1:>5}".format(word, count))

def word_count3(words,n):
    from collections import Counter
    counts = Counter(words)
    for ch in "":  # 删除一些不需要统计的元素
        del counts[ch]
    for word, count in counts.most_common(n):  # 已经按数量大小排好了
        print("{0:<15}{1:>5}".format(word, count))