遍历多个 txt 文件并计算 Python 中所选单词的频率

Question

我有一个练习题，要求我编写一个循环遍历 50 个文本文件并计算每个文本文件中所选单词出现频率的函数。我目前的代码如下所示：

def count(term):
    frequencies = 0
    
    work_dir = "C:/my_work_directory"
    for i in range(1, 51):
        name = "chapter-{i}.txt".format(i=i)
        path = os.path.join(work_dir, name)
        with io.open(path, "r") as fd:
            content = fd.read()
    
        chapter = io.StringIO(content)
        line = chapter.readline()
        print(chapter)
        while line:
            lower = line.lower()
            cleaned = re.sub('[^a-z ]','', lower)
            words = cleaned.strip().split(' ')
            for word in words:
                if word == term:
                    frequencies += 1
            line = chapter.readline()
        
        print(frequencies)

我想要的输出是，如果我输入 count("Man")，我会得到 50 个不同频率的单词“Man”在每个文本文件中出现的频率。但是，我现在得到的只是 50 个零。我很确定这是因为我已经将变量 'frequencies' 初始化为 0，然后没有对它做任何事情。谁能帮我解决这个问题或告诉我哪里出错了？任何帮助将不胜感激，谢谢。

Answer 1

嗯，你的 'Man' 有一个大写字母，而你所有的单词都是小写的。所以第一件事就是在 term 变量上调用 lower() 函数。第二个错误的地方是您保持运行计数，而不是 per-file 计数，您稍后才会注意到。所以将频率变量的初始化移到for循环中。所以它应该看起来像这样。

def count(term):
    term = term.lower()
    
    work_dir = "C:/my_work_directory"
    for i in range(1, 51):
        frequencies = 0

        name = "chapter-{i}.txt".format(i=i)
        path = os.path.join(work_dir, name)
        with io.open(path, "r") as fd:
            content = fd.read()
    
        chapter = io.StringIO(content)
        line = chapter.readline()
        print(chapter)
        while line:
            lower = line.lower()
            cleaned = re.sub('[^a-z ]','', lower)
            words = cleaned.strip().split(' ')
            for word in words:
                if word == term:
                    frequencies += 1
            line = chapter.readline()
        
        print(frequencies)

Answer 2

我运行了它，在我更改 work_dir="" 后它工作正常（因此它查看了本地）。所以我认为你应该检查工作目录路径或断言术语参数是否正确

遍历多个 txt 文件并计算 Python 中所选单词的频率

Loop through multiple txt files and count frequencies of chosen word in Python

python

text-files

word-frequency