Have found a similar issue, however haven't found proper solution.
Here's a code:
import matplotlib.pyplot as plt
plt.plot([1,2,3],[4,2,5])
plt.show()
Run, got the message:
ImportError: No module named 'matplotlib.pyplot'; 'matplotlib' is not a package
I run Linux Mint 18 with preinstalled python-2.7 and python-3.5 (I use python3), before that I was installing modules with a simple sudo apt-get install method and that worked great.
Before running this the code above, I've installed matplotlib in a usual way sudo apt-get install python-matplotlib. As it haven't worked out, started to look for solution.
Python location
which python3 /usr/bin/python3
Current Matplotlib installed
sudo find /usr | grep matplotlib /usr/lib/python3/dist-packages/matplotlib
My tries:
1) I've removed matplotlib with autoremove, and tried to make it sudo apt-get install python3-matplotlib instead. Didn't worked out.
2) Used: pip3 install matplotlib or sudo pip3 install matplotlib. Received errors like:
command python setup.py egg_info failed with error code 1 in /tmp/pip-build- ....
3) Then I found another solution:
sudo apt-get install virtualenv
virtualenv -p /usr/bin/python3 py3env
source py3env/bin/activate
pip install matplotlib
Same outcome.
Haven't tried to use import sys sys.path.append('/usr/lib/pymodules/python2.7/')(proposed in link above), but as I am not sure what exactly this command does (quite a newbie to python and programming itself) - haven't risked.
If you are using pycharm and have matplotlib.py in your current working directory than you get this error. Just delete or rename the matplotlib.py file and it will work.
In your working directory, check if there is any file matplotlib.py Delete that file and import matplotib again. That should work.
don't name any file as matplotlib.py within your working directory
simply install:
python -m pip install -U pip
python -m pip install -U matplotlib
来源：https://stackoverflow.com/questions/41370096/no-module-named-matplotlib-pyplot-matplotlib-is-not-a-package