我在Windows上使用PyCharm。我有一个项目设置，用它自己的虚拟环境进行算法的小实验。我试图安装tensorflow时遇到一个错误，我运行的是pip10.0.1，应该升级到18.1，这是我通过“文件/设置/项目解释器”完成的。现在是18.1。但是我仍然收到关于使用10.0.1版本的警告。在

(venv) C:\users\xxx\pycharmprojects\so> pip list

...

pip 10.0.1

You are using pip version 10.0.1, however version 18.1 is available.

You should consider upgrading via the 'python -m pip install --upgrade pip' command.

(venv) C:\users\xxx\pycharmprojects\so>python -m pip install --upgrade pip

Requirement already up-to-date: pip in c:\users\xxx\pycharmprojects\so\venv\lib\site-packages (18.1)

(venv) C:\users\xxx\pycharmprojects\so> pip list

...

pip 10.0.1

You are using pip version 10.0.1, however version 18.1 is available.

You should consider upgrading via the 'python -m pip install --upgrade pip' command.

(venv) C:\users\xxx\pycharmprojects\so>python -m pip list

...

pip 18.1