Anaconda: matplotlib PdfPages导入错误

Question

我在anaconda环境中从matplotlib包导入PdfPages函数时遇到了一个问题。我得到以下错误：

Python 2.7.13 |Anaconda 4.4.0 (64-bit)| (default, Dec 20 2016, 23:09:15) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux2
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>>> from matplotlib.backends.backend_pdf import PdfPages
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/hpc/capn/mppi033h/.virtualenv/h5_to_histo_env/lib/python2.7/site-packages/matplotlib/backends/backend_pdf.py", line 32, in <module>
    from matplotlib.backend_bases import (RendererBase, GraphicsContextBase,
  File "/home/hpc/capn/mppi033h/.virtualenv/h5_to_histo_env/lib/python2.7/site-packages/matplotlib/backend_bases.py", line 63, in <module>
    import matplotlib.textpath as textpath
  File "/home/hpc/capn/mppi033h/.virtualenv/h5_to_histo_env/lib/python2.7/site-packages/matplotlib/textpath.py", line 17, in <module>
    import matplotlib.font_manager as font_manager
  File "/home/hpc/capn/mppi033h/.virtualenv/h5_to_histo_env/lib/python2.7/site-packages/matplotlib/font_manager.py", line 1439, in <module>
    _rebuild()
  File "/home/hpc/capn/mppi033h/.virtualenv/h5_to_histo_env/lib/python2.7/site-packages/matplotlib/font_manager.py", line 1421, in _rebuild
    with cbook.Locked(cachedir):
  File "/home/hpc/capn/mppi033h/.virtualenv/h5_to_histo_env/lib/python2.7/site-packages/matplotlib/cbook.py", line 2738, in __enter__
    files = glob.glob(self.pattern)
AttributeError: 'module' object has no attribute 'glob'

不过，导入matplotlib (import matplotlib)可以正常工作。我正在使用Anaconda (/.../.virtualenv/h5_to_histo_env/)创建的虚拟环境中运行python。

根据conda-V，我的版本是'conda 4.3.16‘，我的matplotlib版本是2.0.2 ('np112py27_0')。我的Anaconda环境也是最新的，有人知道我为什么会得到这个错误吗？