python如何统计词频 python统计词频

用python实现词频统计

词频统计就是输入一段句子或者一篇文章，然后统计句子中每个单词出现的次数。

那么，这个在python中其实是很好实现的，下面我们来看看具体是怎样实现的，里面又用到了哪些知识呢？

输入一段话，统计每个字母出现的次数

先来讲一下思路：

例如给出下面这样一句话

Love is more than a word
it says so much.
When I see these four letters,
I almost feel your touch.
This is only happened since
I fell in love with you.
Why this word does this,
I haven’t got a clue.

那么想要统计里面每一个单词出现的次数，思路很简单，遍历一遍这个字符串，再定义一个空字典count_dict，看每一个单词在这个用于统计的空字典count_dict中的key中存在否，不存在则将这个单词当做count_dict的键加入字典内，然后值就为1，若这个单词在count_dict里面已经存在，那就将它对应的键的值+1就行

下面来看代码：

#定义字符串
sentences = """           # 字符串很长时用三个引号
Love is more than a word
it says so much.
When I see these four letters,
I almost feel your touch.
This is only happened since
I fell in love with you.
Why this word does this,
I haven't got a clue.
"""
#具体实现
#  将句子里面的逗号去掉,去掉多种符号时请用循环，这里我就这样吧
sentences=sentences.replace(',','')   
sentences=sentences.replace('.','')   #  将句子里面的.去掉
sentences = sentences.split()         # 将句子分开为单个的单词，分开后产生的是一个列表sentences
# print(sentences)
count_dict = {}
for sentence in sentences:
    if sentence not in count_dict:    # 判断是否不在统计的字典中
        count_dict[sentence] = 1
    else:                              # 判断是否不在统计的字典中
        count_dict[sentence] += 1
for key,value in count_dict.items():
    print(f"{key}出现了{value}次")

输出结果是这样：

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