我在 64 位 Mac 上的 Canopy 下安装了 Python 2.7.6，Ipython 版本为 2.1.0。这是一个非常奇怪的问题，我不确定这是否是路径文件问题。每当我导入 matplotlib.pyplot （不仅仅是 matplotlib）时，我都会收到以下错误：
In [2]: import matplotlib.pyplot as plt
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
<ipython-input-2-eff513f636fd> in <module>()
----> 1 import matplotlib.pyplot as plt
/Users/rpatel/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/matplotlib/pyplot.py in <module>()
22
23 import matplotlib
---> 24 import matplotlib.colorbar
25 from matplotlib import _pylab_helpers, interactive
26 from matplotlib.cbook import dedent, silent_list, is_string_like, is_numlike
/Users/rpatel/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/matplotlib/colorbar.py in <module>()
27 import matplotlib.artist as martist
28 import matplotlib.cbook as cbook
---> 29 import matplotlib.collections as collections
30 import matplotlib.colors as colors
31 import matplotlib.contour as contour
/Users/rpatel/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/matplotlib/collections.py in <module>()
21 import matplotlib.artist as artist
22 from matplotlib.artist import allow_rasterization
---> 23 import matplotlib.backend_bases as backend_bases
24 import matplotlib.path as mpath
25 from matplotlib import _path
/Users/rpatel/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/matplotlib/backend_bases.py in <module>()
48
49 import matplotlib.tight_bbox as tight_bbox
---> 50 import matplotlib.textpath as textpath
51 from matplotlib.path import Path
52 from matplotlib.cbook import mplDeprecation
/Users/rpatel/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/matplotlib/textpath.py in <module>()
9 from matplotlib.path import Path
10 from matplotlib import rcParams
---> 11 import matplotlib.font_manager as font_manager
12 from matplotlib.ft2font import FT2Font, KERNING_DEFAULT, LOAD_NO_HINTING
13 from matplotlib.ft2font import LOAD_TARGET_LIGHT
/Users/rpatel/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/matplotlib/font_manager.py in <module>()
51 import matplotlib
52 from matplotlib import afm
---> 53 from matplotlib import ft2font
54 from matplotlib import rcParams, get_cachedir
55 from matplotlib.cbook import is_string_like
ImportError: dlopen(/Users/rpatel/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/matplotlib/ft2font.so, 2): Symbol not found: _inflateReset2
Referenced from: /Users/rpatel/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/matplotlib/../../../../lib/libpng16.dylib
Expected in: /usr/lib/libz.1.dylib
in /Users/rpatel/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/matplotlib/../../../../lib/libpng16.dylib
我似乎无法弄清楚缺少什么或需要安装什么。 Matplotlib 来自 canopy 发行版，因此我可以假设它安装正确。
我遇到了同样的问题，并向 Enthought 提交了请求以寻求帮助，并得到了以下解决方案（来自上面评论的 Jonathan March）。
从 Canopy Tools 菜单中，打开 Canopy Terminal 窗口并调用：
enpkg --no-deps matplotlib 1.2.1
enpkg --no-deps libpng 1.2.40
enpkg --no-deps freetype 2.4.4
显然，至少对于我来说，问题是 matplotlib 1.3 引用了一个不在 OS X 10.6 中的库。所以解决方法是降级 matplotlib。
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