迅速的python奇怪的输出

Question

在终端中运行swift时，我得到了奇怪的输出

 Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/copy.py", line 52, in <module>
    import weakref
  File "/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/weakref.py", line 14, in <module>
    from _weakref import (
ImportError: cannot import name _remove_dead_weakref
Welcome to Apple Swift version 4.1.2 (swiftlang-902.0.54 clang-902.0.39.2). Type :help for assistance.

有人可以帮我解决这个问题吗？提前非常感谢您！