conda 에서 pip 에러(ImportError: No module named _internal)가 뜰 때 해결법

$ conda create -n 이름 python=2.7

으로 가상 환경을 만들고, 가상환경에서 pip 을 쓰려니

    from pip._internal import main

ImportError: No module named _internal

와 같은 에러가 뜬다.

$ curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py

으로 pip 을 다시 받고,

$ python2.7 get-pip.py --force-reinstall

으로 재설치 한다.

$ pip

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

정상 작동 하는 것을 볼 수 있다.

참고: 링크