python清洗。txt文件代码

以下是一个简单的Python代码示例，可以用于清洗文本文件：

import string

def clean_text(text):
    # remove punctuation
    text = text.translate(str.maketrans('', '', string.punctuation))
    # convert to lowercase
    text = text.lower()
    # remove numbers and special characters
    text = ''.join(c for c in text if c.isalpha() or c.isspace())
    # split into words
    words = text.split()
    # remove stopwords
    stopwords = set(['the', 'and', 'a', 'an', 'in', 'of', 'to', 'that', 'it', 'with', 'for', 'on', 'is', 'was', 'by', 'as'])
    words = [w for w in words if w not in stopwords]
    # join words back into text
    text = ' '.join(words)
    return text

# example usage
with open('input.txt', 'r') as f:
    text = f.read()
    clean_text = clean_text(text)
    with open('output.txt', 'w') as out:
        out.write(clean_text)

这个代码可以去除文本中的标点符号、数字和特殊字符，转换为小写字母，去除常用停用词，并将单词分割和连接成干净的文本。