pip安装库用回官方源，检查库内提供的版本

今天自己更新了自己的库到pypi以后，发现无法更新到最新的版本，清华和豆瓣的国内源迟迟不同步
我的国内源配置如下(git bash)

[email protected] MINGW64 ~
$ cat pip/pip.ini
[global]
index-url = https://pypi.tuna.tsinghua.edu.cn/simple
[install]
trusted-host = https://pypi.tuna.tsinghua.edu.cn

使用pip安装，可以看到如下版本信息

C:\Users\admin>pip install -U ssh-lite==
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Collecting ssh-lite==
  Could not find a version that satisfies the requirement ssh-lite== (from versions: 1.1, 1.2, 1.4)
No matching distribution found for ssh-lite==
You are using pip version 18.1, however version 20.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

可以看到最新同步过去的版本是1.4版本，而我实际上已经更新到了1.7版本

两种解决办法

• 暴力的方式，暂时改掉pip.ini，安装后再改回来，可以看到1.7版本

[email protected] MINGW64 ~
$ mv pip/pip.ini pip/pip.ini_bak

[email protected] MINGW64 ~
$ pip install -U ssh-lite==	 # 在这里去掉==，即可安装最新版本
Collecting ssh-lite==
  Could not find a version that satisfies the requirement ssh-lite== (from versions: 1.1, 1.2, 1.4, 1.5, 1.7)
No matching distribution found for ssh-lite==
You are using pip version 18.1, however version 20.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

[email protected] MINGW64 ~
$ mv pip/pip.ini_bak pip/pip.ini

• 也可以用-i来指定镜像，临时绕开国内镜像，也可看到最新版本。只不过这个镜像要正确指定，而竟然没有查到任何文章说明这个问题，我是实验得出，特此记录

C:\Users\admin>pip install -U ssh-lite== -i https://pypi.org/simple
Collecting ssh-lite==
  Could not find a version that satisfies the requirement ssh-lite== (from versions: 1.1, 1.2, 1.4, 1.5, 1.7)
No matching distribution found for ssh-lite==
You are using pip version 18.1, however version 20.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

要点：路径为simple，且服务的地址是pypi.org，而不是实际下载的files.pythonhosted.org