当我将 pip --version 输入终端时，我收到此错误：“未找到 'pip==9.0.1' 发行版，应用程序需要该发行版”

Question

我将 pip --version 放入终端并收到：

Traceback (most recent call last):
      File "/usr/local/bin/pip", line 5, in <module>
        from pkg_resources import load_entry_point
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py", line 3095, in <module>
        @_call_aside
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py", line 3081, in _call_aside
        f(*args, **kwargs)
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py", line 3108, in _initialize_master_working_set
        working_set = WorkingSet._build_master()
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py", line 658, in _build_master
        ws.require(__requires__)
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py", line 959, in require
        needed = self.resolve(parse_requirements(requirements))
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py", line 846, in resolve
        raise DistributionNotFound(req, requirers)
    pkg_resources.DistributionNotFound: The 'pip==9.0.1' distribution was not found and is required by the application

我使用的是 Mac

Answer 1

执行：

sudo easy_install pip

应该可以解决这个问题。