python - future 警告 : The default value of regex will change from True to False in a future version

Question

我正在运行下面的代码来清理文本

import pandas as pd

def not_regex(pattern):
        return r"((?!{}).)".format(pattern)
    
tmp = pd.DataFrame(['No one has a European accent either @',
                    'That the kid   reminds me of Kevin'])

tmp[0].str.replace(not_regex('(\\b[-/]\\b|[a-zA-Z0-9])'), ' ') 

然后它返回一个警告

<ipython-input-8-ef8a43f91dbd>:9: FutureWarning: The default value of regex will change from True to False in a future version.
  tmp[0].str.replace(not_regex('(\\b[-/]\\b|[a-zA-Z0-9])'), ' ')

你能详细说明这个警告的原因吗？

Answer 1

见 Pandas 1.2.0 release notes :

The default value of regex for Series.str.replace() will change from True to False in a future release. In addition, single character regular expressions will not be treated as literal strings when regex=True is set (GH24804)

即，现在明确使用正则表达式:

dframe['colname'] = dframe['colname'].str.replace(r'\D+', regex=True)