无法在ubuntu 16.04中使用pip3

Question

当pip和{}工作正常时，我无法使用pip3。它给了我以下错误。有没有办法我可以改正这个错误。我尝试从get卸载并安装pip-点对点，sudo easy_install pip，sudo apt install python3-pip。但错误依然存在。以下细节一定会有所帮助。在

gajam@gajam:~$ pip3
Traceback (most recent call last):
  File "/home/gajam/.local/bin/pip3", line 7, in <module>
    from pip import main
  File "/home/gajam/.local/bin/pip/__init__.py", line 26, in <module>
    from pip.utils import get_installed_distributions, get_prog
  File "/home/gajam/.local/bin/pip/utils/__init__.py", line 27, in <module>
    from pip._vendor import pkg_resources
  File "/home/gajam/.local/bin/pip/_vendor/pkg_resources/__init__.py", line 3018, in <module>
    @_call_aside
  File "/home/gajam/.local/bin/pip/_vendor/pkg_resources/__init__.py", line 3004, in _call_aside
    f(*args, **kwargs)
  File "/home/gajam/.local/bin/pip/_vendor/pkg_resources/__init__.py", line 3046, in _initialize_master_working_set
    dist.activate(replace=False)
  File "/home/gajam/.local/bin/pip/_vendor/pkg_resources/__init__.py", line 2578, in activate
    declare_namespace(pkg)
  File "/home/gajam/.local/bin/pip/_vendor/pkg_resources/__init__.py", line 2152, in declare_namespace
    _handle_ns(packageName, path_item)
  File "/home/gajam/.local/bin/pip/_vendor/pkg_resources/__init__.py", line 2092, in _handle_ns
    _rebuild_mod_path(path, packageName, module)
  File "/home/gajam/.local/bin/pip/_vendor/pkg_resources/__init__.py", line 2121, in _rebuild_mod_path
    orig_path.sort(key=position_in_sys_path)
AttributeError: '_NamespacePath' object has no attribute 'sort'
gajam@gajam:~$ which pip3
/home/gajam/.local/bin/pip3
gajam@gajam:~$ sudo which pip3
/usr/local/bin/pip3
gajam@gajam:~$ 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.
  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.
gajam@gajam:~$ which pip
/usr/local/bin/pip`

我在安装spacy en model（https://spacy.io/usage/models）时遇到了类似的错误

^{pr2}$

Answer 1

使用sudo pip install通常被认为是个坏主意，因为它会干扰apt。我建议使用虚拟环境。在

sudo apt install python3-venv
python3 -m venv ~/venv
source ~/venv/bin/activate
pip install  upgrade pip wheel setuptools
pip install <whatever you want to install>

根据要安装的Python包，您可能需要GCC和二进制依赖项的开发包。在

^{pr2}$