导入matplotlib不起作用

Question

In my terminal window, i open the ipython enviroment, and then type in import matplotlib.pyplot as plt . The error message I get from doing this is:

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

/Users/arazipinhas/anaconda/lib/python2.7/site-packages/matplotlib/pyplot.py in <module>()
     25 
     26 import matplotlib
---> 27 import matplotlib.colorbar
     28 from matplotlib import style
     29 from matplotlib import _pylab_helpers, interactive

/Users/arazipinhas/anaconda/lib/python2.7/site-packages/matplotlib/colorbar.py in <module>()
     32 import matplotlib.artist as martist
     33 import matplotlib.cbook as cbook
---> 34 import matplotlib.collections as collections
     35 import matplotlib.colors as colors
     36 import matplotlib.contour as contour

/Users/arazipinhas/anaconda/lib/python2.7/site-packages/matplotlib/collections.py in <module>()
     25 import matplotlib.artist as artist
     26 from matplotlib.artist import allow_rasterization
---> 27 import matplotlib.backend_bases as backend_bases
     28 import matplotlib.path as mpath
     29 from matplotlib import _path

/Users/arazipinhas/anaconda/lib/python2.7/site-packages/matplotlib/backend_bases.py in <module>()
     54 
     55 import matplotlib.tight_bbox as tight_bbox
---> 56 import matplotlib.textpath as textpath
     57 from matplotlib.path import Path
     58 from matplotlib.cbook import mplDeprecation

/Users/arazipinhas/anaconda/lib/python2.7/site-packages/matplotlib/textpath.py in <module>()
     20 from matplotlib.ft2font import FT2Font, KERNING_DEFAULT, LOAD_NO_HINTING
     21 from matplotlib.ft2font import LOAD_TARGET_LIGHT
---> 22 from matplotlib.mathtext import MathTextParser
     23 import matplotlib.dviread as dviread
     24 from matplotlib.font_manager import FontProperties

/Users/arazipinhas/anaconda/lib/python2.7/site-packages/matplotlib/mathtext.py in <module>()
     61 
     62 import matplotlib.colors as mcolors
---> 63 import matplotlib._png as _png
     64 ####################
     65 

ImportError: dlopen(/Users/arazipinhas/anaconda/lib/python2.7/site-packages/matplotlib/_png.so, 2): Library not loaded: @loader_path/../../../libpng15.15.dylib
  Referenced from: /Users/arazipinhas/anaconda/lib/python2.7/site-packages/matplotlib/_png.so
  Reason: image not found

I would truly appreciate a way to resolve this issue. All I want to do is get on with my physics, and all this constant computational setback is quite cumbersome and annoying. I should thus appreciate an expedited response from anyone who may be willing to assist.

Answer 1

ImportError: dlopen(/Users/arazipinhas/anaconda/lib/python2.7/site-packages/matplotlib/_png.so, 2):
Library not loaded: @loader_path/../../../libpng15.15.dylib

really simple: Your matplotlib was linked against libpng15, but that isn't found by your run-time. So you might search for that file, libpng15.15.dylib . If it's missing, your installation is incomplete and you're probably missing the version of libPNG that was used to build matplotlib.

Answer 2

Continuum recently updated libpng, which caused this breakage. Sorry for the inconvenience.

The way to fix this error is to run in a terminal

conda update qt
conda update matplotlib