Python 为什么pyinstaller没有加载/执行

每当我在使用pip安装（在mac上）后尝试使用pyinstaller时，我都会收到以下错误。有人能帮我解决这个问题吗。使用pyinstaller找到的路径，但尝试添加到$path时未找到该路径：

Traceback (most recent call last):
  File "/usr/local/bin/pyinstaller", line 6, 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 660, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py", line 673, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py", line 851, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (altgraph 0.10.2 (/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python), Requirement.parse('altgraph>=0.15'), set(['macholib']))

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我也犯了同样的错误。。。通过在我用户的python路径下安装一个更新的altgraph包，解决了这个问题。希望这有助于其他人找到此页面

pip install --user altgraph==0.15

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有人能帮我吗？非常感谢。也为我工作。使用Python2.7变得越来越困难。

pip install --user altgraph==0.15