easy_install 失败，找不到 setuptools

Question

我有一个下载的 .egg 文件，我想easy_install。所以我发出：easy_install my.egg 它失败了：

$ which easy_install
/usr/local/opt/python2/libexec/bin/easy_install    
$ easy_install my.egg
Traceback (most recent call last):
      File "/usr/local/opt/python2/libexec/bin/easy_install", line 6, in <module>
        from pkg_resources import load_entry_point
      File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3195, in <module>
        @_call_aside
      File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3179, in _call_aside
        f(*args, **kwargs)
      File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3208, in _initialize_master_working_set
        working_set = WorkingSet._build_master()
      File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 683, in _build_master
        return cls._build_from_requirements(__requires__)
      File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 696, in _build_from_requirements
        dists = ws.resolve(reqs, Environment())
      File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 885, in resolve
        raise DistributionNotFound(req, requirers)
    pkg_resources.DistributionNotFound: The 'setuptools==38.5.1' distribution was not found and is required by the application

所以我尝试pip setuptools 也失败了：

$ pip setuptools
Traceback (most recent call last):
  File "/usr/local/opt/python2/libexec/bin/pip", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3195, in <module>
    @_call_aside
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3179, in _call_aside
    f(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3208, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 683, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 696, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 885, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pip==9.0.1' distribution was not found and is required by the application

我不知道 pip 是如何进入无法工作的状态的，但是我找到了https://stackoverflow.com/a/43311811/201657，这让我发现我在/usr/local/bin/pip 有另一个点：

$ /usr/local/bin/pip --version
pip 9.0.3 from /usr/local/lib/python2.7/site-packages (python 2.7)

所以我尝试这样做：

$ /usr/local/bin/pip install setuptools
Requirement already satisfied: setuptools in /usr/local/lib/python2.7/site-packages

我承认我不知道这里发生了什么，也不知道如何解决它。恐怕我有点像蟒蛇菜鸟。一些指针会很方便。如何成功运行easy_install my.egg？

顺便说一句，我在 macOS 上。

Answer 1

执行：

sudo easy_install pip

应该可以解决这个问题。修复 pip 后，您可以继续下载其他包。