install 某个 package
pip install sampleproject
从文件安装某个package (source distribution 或 wheel distribution)
pip install sampleproject-1.0.tar.gz
pip install sampleproject-1.0-py3-none-any.whl
从安装包目录或列表安装：
pip install sampleproject -f https://www.xyz.com/xxx/xxx.html
-f 参数指定了一个 HTML 文件链接（或者一个本地目录），HTML文件（或者一个本地目录）中包含了多个的wheel安装包链接（或文件），pip根据当前的python版本选择一个安装包。
-f, --find-links <url> If a url or path to an html file, then parse for links to archives. If a local path or file:// url that's a directory, then look for archives in the directory listing.
使用 requirement文件安装多个package
pip install -r requirements.txt
upgrade某个package
pip install --upgrade sampleproject
