>>> import matplotlib.pyplot as plt
  ---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-4-eff513f636fd> in <module>()
----> 1 import matplotlib.pyplot as plt

/Library/anaconda/envs/py3/lib/python3.5/site-packages/matplotlib/pyplot.py in <module>()
     27 from cycler import cycler
     28 import matplotlib
---> 29 import matplotlib.colorbar
     30 from matplotlib import style
     31 from matplotlib import _pylab_helpers, interactive

/Library/anaconda/envs/py3/lib/python3.5/site-packages/matplotlib/colorbar.py in <module>()
     34 import matplotlib.collections as collections
     35 import matplotlib.colors as colors
---> 36 import matplotlib.contour as contour
     37 import matplotlib.cm as cm
     38 import matplotlib.gridspec as gridspec

/Library/anaconda/envs/py3/lib/python3.5/site-packages/matplotlib/contour.py in <module>()
     21 import matplotlib.collections as mcoll
     22 import matplotlib.font_manager as font_manager
---> 23 import matplotlib.text as text
     24 import matplotlib.cbook as cbook
     25 import matplotlib.mlab as mlab

/Library/anaconda/envs/py3/lib/python3.5/site-packages/matplotlib/text.py in <module>()
     31 from matplotlib.artist import allow_rasterization
     32 
---> 33 from matplotlib.backend_bases import RendererBase
     34 from matplotlib.textpath import TextPath
     35 

/Library/anaconda/envs/py3/lib/python3.5/site-packages/matplotlib/backend_bases.py in <module>()
     61 
     62 import matplotlib.tight_bbox as tight_bbox
---> 63 import matplotlib.textpath as textpath
     64 from matplotlib.path import Path
     65 from matplotlib.cbook import mplDeprecation, warn_deprecated

/Library/anaconda/envs/py3/lib/python3.5/site-packages/matplotlib/textpath.py in <module>()
     18 from matplotlib.ft2font import KERNING_DEFAULT, LOAD_NO_HINTING
     19 from matplotlib.ft2font import LOAD_TARGET_LIGHT
---> 20 from matplotlib.mathtext import MathTextParser
     21 import matplotlib.dviread as dviread
     22 from matplotlib.font_manager import FontProperties, get_font

/Library/anaconda/envs/py3/lib/python3.5/site-packages/matplotlib/mathtext.py in <module>()
     60 
     61 import matplotlib.colors as mcolors
---> 62 import matplotlib._png as _png
     63 
     64 ####################

ImportError: dlopen(/Library/anaconda/envs/py3/lib/python3.5/site-packages/matplotlib/_png.cpython-35m-darwin.so, 2): 

Library not loaded: @rpath/libpng16.16.dylib
  Referenced from: 

/Library/anaconda/envs/py3/lib/python3.5/site-packages/matplotlib/_png.cpython-35m-darwin.so
  Reason: 

Incompatible library version: _png.cpython-35m-darwin.so requires version 43.0.0 or later, but libpng16.16.dylib provides version 39.0.0