Python使用pip安装pySerial串口通讯模块

G:\>pip 
 
Usage: 
 pip <command> [options] 
 
Commands: 
 install           Install packages. 
 uninstall          Uninstall packages. 
 freeze           Output installed packages in requirements format. 
 list            List installed packages. 
 show            Show information about installed packages. 
 search           Search PyPI for packages. 
 wheel            Build wheels from your requirements. 
 help            Show help for commands. 
 
General Options: 
 -h, --help         Show help. 
 --isolated         Run pip in an isolated mode, ignoring 
               environment variables and user configuration. 
 -v, --verbose        Give more output. Option is additive, and can be 
               used up to 3 times. 
 -V, --version        Show version and exit. 
 -q, --quiet         Give less output. 
 --log <path>        Path to a verbose appending log. 
 --proxy <proxy>       Specify a proxy in the form 
               [user:passwd@]proxy.server:port. 
 --retries <retries>     Maximum number of retries each connection should 
               attempt (default 5 times). 
 --timeout <sec>       Set the socket timeout (default 15 seconds). 
 --exists-action <action>  Default action when a path already exists: 
               (s)witch, (i)gnore, (w)ipe, (b)ackup. 
 --trusted-host <hostname>  Mark this host as trusted, even though it does 
               not have valid or any HTTPS. 
 --cert <path>        Path to alternate CA bundle. 
 --client-cert <path>    Path to SSL client certificate, a single file 
               containing the private key and the certificate 
               in PEM format. 
 --cache-dir <dir>      Store the cache data in <dir>. 
 --no-cache-dir       Disable the cache. 
 --disable-pip-version-check 
               Don't periodically check PyPI to determine 
               whether a new version of pip is available for 
               download. Implied with --no-index.