python文本處理

1.在文本提取URL

這個主要用於爬蟲技術：

把爬取的html頁面保存爲一個字符串，再從字符串中進行提取URL

好比把一個字符串保存在文件中

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而後使用findall()函數進行查找和正則表達式有關的實例。
import re

with open("path\url_example.txt") as file:
        for line in file:
            urls = re.findall('https?://(?:[-\w.]|(?:%[\da-fA-F]{2}))+', line)
            print(urls)