Windows上的Matplotlib - 依赖性尚未解决

Question

我在Windows更新后使用matplotlib时遇到问题.我运行Windows 7 Service Pack 1的32位和我安装Python和matplotlib像Python的部分(X,Y)-2.7.6.1.问题似乎与FreeType有关,因为导入在ft2font上失败,如下面的堆栈跟踪所示:

In [1]: import matplotlib

In [2]: matplotlib.use('agg')

In [3]: import matplotlib.pyplot as plt
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-3-eff513f636fd> in <module>()
----> 1 import matplotlib.pyplot as plt

C:\Python27\lib\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

C:\Python27\lib\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

C:\Python27\lib\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

C:\Python27\lib\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

C:\Python27\lib\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

C:\Python27\lib\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: DLL load failed: The specified procedure could not be found.

我尝试重新安装Python(x,y),但这并没有解决问题.

从Stackoverflow上的其他答案我了解到,这里的常见故障包括丢失msvcr90.dll和msvcp90.dll文件.我下载了Dependency Walker并打开了c:\Python27\Lib\site-packages\matplotlib\FT2FONT.PYD.这显示了这些文件的问题libbz2.dll.我下载并复制了这些文件c:\windows\system32.

我也尝试检查我的PATH和PYTHONPATH环境变量,但它们似乎正确地引用了我的Python安装:

PATH: C:\Python27\Lib\site-packages\PyQt4;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Novell\GroupWise;C:\Program Files\MiKTeX 2.9\miktex\bin\;C:\Program Files\Microsoft SQL Server\80\Tools\Binn\;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files\Common Files\AspenTech Shared\;C:\Python27;C:\Python27\DLLs;C:\Python27\Scripts;C:\Python27\gnuplot\binary;C:\Program Files\pythonxy\SciTE-3.3.2-3;C:\Program Files\pythonxy\console;C:\MinGW32-xy\bin;C:\Python27\Lib\site-packages\vtk
PYTHONPATH: c:\Python27\DLLs

即使只使用上面会话中显示的Agg后端,问题也会出现,所以我认为它与Qt或tk没有任何关系.

Answer 1

似乎问题是由安装了不同/不兼容版本的BZ2的应用程序引起的C:\Windows\System32\libbz2.dll.这被用来代替Python(x,y)安装的Python27目录中的同名DLL.这就是Dependency Walker中出现的情况:

您可以看到,libbz2.dll即使Dependency Walker没有将其列为依赖性错误,也存在问题.重命名或删除版本C:\Windows\System32\导致依赖项由版本中的解析c:\Python27\DLLs.