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我是一个红宝石开发人员，我已经开始学习一个项目的Python。我安装了pyenv，pyenv virutualenv，ipython，notebook，matplotlib。一切正常，除了我叫不能导入matplotlib与pyenv ipython笔记本
import matplotlib.pyplot as plot
的一部分，那么我已经得到了笔记本这个错误：
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call last)
<ipython-input-1-08ad587cbf6a> in <module>()
----> 1 import matplotlib.pyplot as plot
/Users/ilab/.pyenv/versions/2.7.11/envs/mlcoursera/lib/python2.7/site-packages/matplotlib/pyplot.py in <module>()
112
113 from matplotlib.backends import pylab_setup
--> 114 _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
115
116 _IP_REGISTERED = None
/Users/ilab/.pyenv/versions/2.7.11/envs/mlcoursera/lib/python2.7/site-packages/matplotlib/backends/__init__.pyc in pylab_setup()
30 # imports. 0 means only perform absolute imports.
31 backend_mod = __import__(backend_name,
---> 32 globals(),locals(),[backend_name],0)
33
34 # Things we pull in from all backends
/Users/ilab/.pyenv/versions/2.7.11/envs/mlcoursera/lib/python2.7/site-packages/matplotlib/backends/backend_macosx.py in <module>()
22
23 import matplotlib
---> 24 from matplotlib.backends import _macosx
25
26
RuntimeError: Python is not installed as a framework. The Mac OS X backend will not be able to function correctly if Python is not installed as a framework. See the Python documentation for more information on installing Python as a framework on Mac OS X. Please either reinstall Python as a framework, or try one of the other backends. If you are Working with Matplotlib in a virtual enviroment see 'Working with Matplotlib in Virtual environments' in the Matplotlib FAQ.
谁能帮助我得到这个工作？
ps：我在Python 2.7.1与pyenv。