在最近几天的某个时候，Matplotlib停止在OS X上为我工作。这是我尝试执行import matplotlib以下操作时遇到的错误：

Traceback (most recent call last):
  File "/my/path/to/script/my_script.py", line 15, in <module>
    import matplotlib.pyplot as plt
  File "/Library/Python/2.7/site-packages/matplotlib/pyplot.py", line 34, in <module>
    from matplotlib.figure import Figure, figaspect
  File "/Library/Python/2.7/site-packages/matplotlib/figure.py", line 40, in <module>
    from matplotlib.axes import Axes, SubplotBase, subplot_class_factory
  File "/Library/Python/2.7/site-packages/matplotlib/axes/__init__.py", line 4, in <module>
    from ._subplots import *
  File "/Library/Python/2.7/site-packages/matplotlib/axes/_subplots.py", line 10, in <module>
    from matplotlib.axes._axes import Axes
  File "/Library/Python/2.7/site-packages/matplotlib/axes/_axes.py", line 22, in <module>
    import matplotlib.dates as _  # <-registers a date unit converter
  File "/Library/Python/2.7/site-packages/matplotlib/dates.py", line 126, in <module>
    from dateutil.rrule import (rrule, MO, TU, WE, TH, FR, SA, SU, YEARLY,
  File "/Library/Python/2.7/site-packages/dateutil/rrule.py", line 14, in <module>
    from six.moves import _thread
ImportError: cannot import name _thread

我能想到的唯一的系统更改是Apple强制的NTP更新，也许我在/ usr / local中进行了一些权限更改，以使Brew重新工作。

我尝试通过Pip重新安装Matplotlib和Python-dateutil，但这没有帮助。还尝试了重启。我正在运行Python 2.7.6，它位于/
usr / bin / python中。我正在运行优胜美地（OS X 10.10.1）。