data_list = re.findall(r'(-?\d+\.?\d*)', line, re.S)
时间: 2024-06-02 13:10:36
浏览: 65
这行代码使用 Python 的 re 模块中的 findall [函数](https://geek.csdn.net/educolumn/ba94496e6cfa8630df5d047358ad9719?dp_token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6NDQ0MDg2MiwiZXhwIjoxNzA3MzcxOTM4LCJpYXQiOjE3MDY3NjcxMzgsInVzZXJuYW1lIjoid2VpeGluXzY4NjQ1NjQ1In0.RrTYEnMNYPC7AQdoij4SBb0kKEgHoyvF-bZOG2eGQvc&spm=1055.2569.3001.10083),根据[正则表达式](https://geek.csdn.net/educolumn/b04e5fff38104b983e9ace05416bf01b?dp_token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6NDQ0MDg2MiwiZXhwIjoxNzA3MzcxOTM4LCJpYXQiOjE3MDY3NjcxMzgsInVzZXJuYW1lIjoid2VpeGluXzY4NjQ1NjQ1In0.RrTYEnMNYPC7AQdoij4SBb0kKEgHoyvF-bZOG2eGQvc&spm=1055.2569.3001.10083)模式从[字符串](https://geek.csdn.net/educolumn/ba94496e6cfa8630df5d047358ad9719?dp_token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6NDQ0MDg2MiwiZXhwIjoxNzA3MzcxOTM4LCJpYXQiOjE3MDY3NjcxMzgsInVzZXJuYW1lIjoid2VpeGluXzY4NjQ1NjQ1In0.RrTYEnMNYPC7AQdoij4SBb0kKEgHoyvF-bZOG2eGQvc&spm=1055.2569.3001.10083) line 中查找所有的数字,将它们作为[字符串](https://geek.csdn.net/educolumn/ba94496e6cfa8630df5d047358ad9719?dp_token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6NDQ0MDg2MiwiZXhwIjoxNzA3MzcxOTM4LCJpYXQiOjE3MDY3NjcxMzgsInVzZXJuYW1lIjoid2VpeGluXzY4NjQ1NjQ1In0.RrTYEnMNYPC7AQdoij4SBb0kKEgHoyvF-bZOG2eGQvc&spm=1055.2569.3001.10083)存入[列表](https://geek.csdn.net/educolumn/ba94496e6cfa8630df5d047358ad9719?dp_token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6NDQ0MDg2MiwiZXhwIjoxNzA3MzcxOTM4LCJpYXQiOjE3MDY3NjcxMzgsInVzZXJuYW1lIjoid2VpeGluXzY4NjQ1NjQ1In0.RrTYEnMNYPC7AQdoij4SBb0kKEgHoyvF-bZOG2eGQvc&spm=1055.2569.3001.10083) data_list 中返回。
具体来说,正则表达式模式为 r'(-?\d+\.?\d*)',其中:
- \d 匹配任意一个数字字符(0-9);
- + 表示匹配前面的字符一次或多次;
- ? 表示匹配前面的字符零次或一次;
- -? 表示匹配前面的负号零次或一次;
- \.? 表示匹配前面的小数点零次或一次;
- \d* 表示匹配前面的数字零次或多次。
因此,整个正则表达式模式可以匹配如下数字格式:
- -42
- 3.14
- -3.14
- -.5
注意,正则表达式模式中的 re.S 标志表示启用 DOTALL 模式,在这种模式下,点号(.)匹配任何字符,包括换行符。
相关问题
tlt = re.findall(r'data-title\=\".*?\"',html)
This line of code uses the Python regular expression module `re` to search for all occurrences of a string pattern within the `html` variable. The pattern being searched for is `data-title\=\".*?\"`, which matches any string within `html` that begins with `data-title="` and ends with a double quote (`"`), with any char
Traceback (most recent call last): File "D:\Project\exp\q.py", line 19, in <module> info = url.find('p', {'class': ''}).get_text().strip() ^^^^^^^^ File "C:\Users\Chen\AppData\Local\Programs\Python\Python311\Lib\site-packages\bs4\element.py", line 2428, in __getattr__ raise AttributeError( AttributeError: ResultSet object has no attribute 'find'. You're probably treating a list of elements like a single element. Did you call find_all() when you meant to call find()?
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