python之如何在 Python 中安装 'warnings' 包

我见过 Python 程序使用

import warnings 

如何安装那个包？我试过了

pip install --upgrade warnings 

遇到错误

Collecting warnings 
  Could not find a version that satisfies the requirement warnings (from versions: ) 
No matching distribution found for warnings 

请您参考如下方法:

warnings 是内置的。无需安装。