'from yade import plot' causing error

Hi,

For the record, there are no functions to blame here : the problem arises when you "import plot" (as you should see if you just type this in your YADE terminal), which is importing the YADE *module* "plot"
(this module defines functions such as plot.plot() )

Going further (following what the error says) the error comes from a failed "import matplotlib", that is called by the "import plot", where matplotlib is an external Python module, not provided by YADE.

In the end, I think you would get the same error typing "import matplotlib" in your YADE terminal, which is a (2.7) Python terminal, and your question should be entitled "import matplotlib error" ;-)

Looking through the Internet for similar errors (in the general Python community) gives things like e.g. [*]. Maybe they can help...
(I do not know the answer myself even though I hope I could make the situation clearer...)

[*] https://stackoverflow.com/questions/50150952/cannot-import-matplotlib-after-update-to-ubuntu-18-04-due-to-missing-functools

Hello Jerome, Thank you for replying. Firstly, I changed the title of the question as told by you. Secondly, I followed all the troubleshooting methods explained in this post (https://stackoverflow.com/questions/47179433/python-2-7-functools-lru-cache-does-not-import-although-installed/49335954#49335954) but I am still getting the same error:
----------------------------------------------------------
In [1]: from yade import plot
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
/usr/bin/yade in <module>()
----> 1 from yade import plot

/usr/lib/x86_64-linux-gnu/yade/py/yade/plot.py in <module>()
     23
     24
---> 25 import matplotlib,os,time,math,itertools
     26
     27 # running in batch

/usr/lib/python2.7/dist-packages/matplotlib/__init__.py in <module>()
    125 _backports, mplDeprecation, dedent, get_label, sanitize_sequence)
    126 from matplotlib.compat import subprocess
--> 127 from matplotlib.rcsetup import defaultParams, validate_backend, cycler
    128
    129 import numpy

/usr/lib/python2.7/dist-packages/matplotlib/rcsetup.py in <module>()
     27
     28 from matplotlib.cbook import mplDeprecation, deprecated, ls_mapper
---> 29 from matplotlib.fontconfig_pattern import parse_fontconfig_pattern
     30 from matplotlib.colors import is_color_like
     31

/usr/lib/python2.7/dist-packages/matplotlib/fontconfig_pattern.py in <module>()
     30 from functools import lru_cache
     31 except ImportError:
---> 32 from backports.functools_lru_cache import lru_cache
     33
     34 family_punc = r'\\\-:,'

ImportError: No module named functools_lru_cache
-------------------------------------------
Any help to troubleshoot this would be appreciated. I am not able to use YADE because of this for quite a long time.

Hello all, this answer did the trick for me (https://stackoverflow.com/a/47317710/4365590).