Importing matplotlib.pyplot - requiring pyqt4? Python 3.5.2

Question

I'm having issues import matplotlib.pyplot. I recently updated to Python 3.5.2. The error it gives me is as such:

ImportError: Matplotlib qt-based backends require an external PyQt4, PyQt5, or PySide package to be installed, but it was not found.

So I install PyQt5 using pip install pyqt5, and I successfully install it. I run my code again, and then I get a different error:

ImportError: No module named 'PyQt4'

So I use pip (pip install pyqt4) and attempt to install it. I get another error saying that PyQt4 can not be installed in the command prompt:

(User) C:\Users\Username>pip install pyqt4

Collecting pyqt4

Could not find a version that satisfies the requirement pyqt4 (from versions: ) No matching distribution found for pyqt4

So my question is, is what do I need to do to be able to import this package?

Place this 2 lines in the initial part of the file: import matplotlib matplotlib.use('Qt5Agg') — eyllanesc
– eyllanesc, Commented Aug 23, 2017 at 18:43
could show the code you are using and where you have placed what I suggested. — eyllanesc
– eyllanesc, Commented Aug 23, 2017 at 18:49
If you have pyqt5 installed, you don't need pyqt4 for running matplotlib. It will require either of them, not both. I'm not sure but I think installing pyqt4 for python3 is not straight forward, so don't dive into this if you don't have to. There is also a similar question being asked here. — ImportanceOfBeingErnest
– ImportanceOfBeingErnest, Commented Aug 23, 2017 at 18:50
Your code should have the following form: import matplotlib matplotlib.use('Qt5Agg') import matplotlib.pyplot as plt — eyllanesc
– eyllanesc, Commented Aug 23, 2017 at 18:50

Brandon Molyneaux · Accepted Answer · 2017-09-15 13:46:28Z

0

I had to install PyQt4, even though I have PyQt5. Using

import matplotlib
matplotlib.use('Qt5Agg')
import matplotlib.pyplot as plt

did not work in my case.

answered Sep 15, 2017 at 13:46

Brandon Molyneaux

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1 Comment

Benares Over a year ago

Same for me. Neither Pyside, Pyside2 or PyQt5 worked. I installed PyQt4 with the package manager, sudo apt-get install python3-pyqt4 and it worked.

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