1. pip3命令是Python的一个包管理工具，用于安装、升级、卸载Python包。
2. pip3命令可以通过指定包名和版本号来安装、升级、卸载Python包，也可以通过指定requirements.txt文件来批量安装多个Python包。
3. 此外，pip3命令还支持一些其他的功能，比如查看已安装的包、搜索包、导出已安装的包列表等。
通过pip3命令，可以方便地管理Python包，提高开发效率。
pip3命令详解
pip命令详解
首先输入pip -h查看pip命令
1 Usage:
2 pip <command> [options]
3
4 Commands:
5 install Install packages.
6 download Download packages.
7 uninstall Uninstall packages.
8 freeze Output installed packages in requirements format.
9 list List installed packages.
10 show Show information about installed packages.
11 check Verify installed packages have compatible dependencies.
12 config Manage local and global configuration.
13 search Search PyPI for packages.
14 wheel Build wheels from your requirements.
15 hash Compute hashes of package archives.
16 completion A helper command used for command completion.
17 help Show help for commands.
18
19 General Options:
20 -h, --help Show help.
21 --isolated Run pip in an isolated mode, ignoring environment variables and user configuration.
22 -v, --verbose Give more output. Option is additive, and can be used up to 3 times.
23 -V, --version Show version and exit.
24 -q, --quiet Give less output. Option is additive, and can be used up to 3 times (corresponding
25 to WARNING, ERROR, and CRITICAL logging levels).
26 --log <path> Path to a verbose appending log.
27 --proxy <proxy> Specify a proxy in the form [user:passwd@]proxy.server:port.
28 --retries <retries> Maximum number of retries each connection should attempt (default 5 times).
29 --timeout <sec> Set the socket timeout (default 15 seconds).
30 --exists-action <action> Default action when a path already exists: (s)witch, (i)gnore, (w)ipe, (b)ackup,
31 (a)bort).
32 --trusted-host <hostname> Mark this host as trusted, even though it does not have valid or any HTTPS.
33 --cert <path> Path to alternate CA bundle.
34 --client-cert <path> Path to SSL client certificate, a single file containing the private key and the
35 certificate in PEM format.
36 --cache-dir <dir> Store the cache data in <dir>.
37 --no-cache-dir Disable the cache.
38 --disable-pip-version-check
39 Don't periodically check PyPI to determine whether a new version of pip is available
40 for download. Implied with --no-index.
41 --no-color Suppress colored output
安装库：pip innstall xxxx
下载库：pip download xxxx
卸载库：pip uninstall xxxx
按照特定格式输出已安装的库：pip freeze
输出已安装的库：pip list
显示某个已安装库的信息：pip show xxxx