pip基础用法

1.ModuleNotFoundError: No module named 'pip'

解决办法：

windows,在cmd命令窗口中输入：

python -m ensurepip

2.pip自身升级

python -m pip install --upgrade pip

3.pip国内镜像

清华：https://pypi.tuna.tsinghua.edu.cn/simple

安装示例（如安装pymongo库）：

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pymongo

 4.pip安装,升级和卸载模块

示例：安装Request模块

# 安装
pip install Request

# 升级
pip install --upgrade Request

# 卸载
pip uninstall Request

5.查看需要升级的模块

pip list --outdated

6.pip --help命令

C:\Users\zz>pip --help

Usage:
  pip <command> [options]

Commands:
  install                     Install packages.
  download                    Download packages.
  uninstall                   Uninstall packages.
  freeze                      Output installed packages in requirements format.
  list                        List installed packages.
  show                        Show information about installed packages.
  check                       Verify installed packages have compatible dependencies.
  config                      Manage local and global configuration.
  search                      Search PyPI for packages.
  wheel                       Build wheels from your requirements.
  hash                        Compute hashes of package archives.
  completion                  A helper command used for command completion.
  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. Option is additive,
                              and can be used up to 3 times
                              (corresponding to WARNING, ERROR, and
                              CRITICAL logging levels).
  --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, (a)bort).
  --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.
  --no-color                  Suppress colored output