pip3 安装 pyautogui 失败，错误代码 1 Mac OS

我尝试安装 autogui python 扩展：

pip3 install pyautogui

此安装尝试会导致以下错误消息：

Collecting pyautogui
  Using cached PyAutoGUI-0.9.33.zip
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/00/zcr6mkx90hg7kr4x_ks6nhhw0000gn/T/pip-build-edy15oyn/pyautogui/setup.py", line 6, in <module>
        version=__import__('pyautogui').__version__,
      File "/private/var/folders/00/zcr6mkx90hg7kr4x_ks6nhhw0000gn/T/pip-build-edy15oyn/pyautogui/pyautogui/__init__.py", line 110, in <module>
        from . import _pyautogui_osx as platformModule
      File "/private/var/folders/00/zcr6mkx90hg7kr4x_ks6nhhw0000gn/T/pip-build-edy15oyn/pyautogui/pyautogui/_pyautogui_osx.py", line 4, in <module>
        import Quartz
      File "/usr/local/lib/python3.5/site-packages/Quartz/__init__.py", line 5, in <module>
        import objc
      File "/usr/local/lib/python3.5/site-packages/objc/__init__.py", line 18, in <module>
        _update()
      File "/usr/local/lib/python3.5/site-packages/objc/__init__.py", line 15, in _update
        import objc._objc as _objc
    ImportError: dlopen(/usr/local/lib/python3.5/site-packages/objc/_objc.cpython-35m-darwin.so, 2): Symbol not found: _PyObject_REPR
      Referenced from: /usr/local/lib/python3.5/site-packages/objc/_objc.cpython-35m-darwin.so
      Expected in: flat namespace
     in /usr/local/lib/python3.5/site-packages/objc/_objc.cpython-35m-darwin.so

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/00/zcr6mkx90hg7kr4x_ks6nhhw0000gn/T/pip-build-edy15oyn/pyautogui

我的Mac OS版本是OS X El Capitan 10.11.3，我的Python3版本是3.5.1，我的pip3版本是pip 8.0.2。

Stackoverflow 上似乎有类似的问题（无法安装pip install pyautogui，错误代码1 https://stackoverflow.com/questions/34502965/cannot-install-pip-install-pyautogui-error-code-1），但该修复不适用于我的问题；我已经安装了“枕头”。另外，我已经阅读了文档（https://pypi.python.org/pypi/PyAutoGUI https://pypi.python.org/pypi/PyAutoGUI），并安装了 pyobjc-core 以及 pyobjc。安装工具已安装且是最新的。

有谁知道如何修复此错误（并安装 pyautogui）？我认为错误可能源于，因为Python 3.5.1 中缺少 _PyObject_REPR https://bitbucket.org/ronaldoussoren/pyobjc/issues/137/symbol-not-found-_pyobject_repr-on-python.

I found 解决方法 https://bitbucket.org/ronaldoussoren/pyobjc/issues/137/symbol-not-found-_pyobject_repr-on-python。 “Kentzo”的这段代码为我解决了这个问题：

pip3 install https://github.com/GreatFruitOmsk/pyobjc-core/releases/download/v3.0.5.dev0/pyobjc-core-3.0.5.tar.gz

由于该代码不是我编写的，因此请自行承担使用此解决方法的风险。