Can't Start Spyder Because Of Pyqt5.qtwebkitwidgets

I have a problem with spyder. I just installed on this laptop Python 3.7 and Spyder, as I did on many others. However this time, it doesn't work. I installed Python 3.7.2 (tags/v3.

Solution 1:

I swapped Pyqt5 version from 5.12 to 5.11.2 with:

py -m pip install pyqt5==5.11.2

And now it works...

Solution 2:

Three days ago I was playing around with Python, Mayavi and Jupyter Notebooks to create visualizations. This required to install PyQt5.

Due to constantly reaching memory errors, I've decided to test without using virtualenv's and installed the needed requirements on my local environment (which of course didn't solve).

After that, I was on my way to create visualizations using matplotlib and other Python libraries but can't launch Spyder from the Anaconda Navigator.

This is the error showing up, which is similar to yours

Traceback (most recent call last):
File "C:\Users\tiago\Anaconda3\lib\site-packages\qtpy\QtWebEngineWidgets.py", line 22, infrom PyQt5.QtWebEngineWidgets import QWebEnginePage
ModuleNotFoundError: No module named 'PyQt5.QtWebEngineWidgets'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:\Users\tiago\Anaconda3\Scripts\spyder-script.py", line 10, in 
sys.exit(main())
File "C:\Users\tiago\Anaconda3\lib\site-packages\spyder\app\start.py", line 186, in main
from spyder.app import mainwindow
File "C:\Users\tiago\Anaconda3\lib\site-packages\spyder\app\mainwindow.py", line 90, infrom qtpy import QtWebEngineWidgets # analysis:ignore
File "C:\Users\tiago\Anaconda3\lib\site-packages\qtpy\QtWebEngineWidgets.py", line 26, infrom PyQt5.QtWebKitWidgets import QWebPage as QWebEnginePage
ModuleNotFoundError: No module named 'PyQt5.QtWebKitWidgets'

The correct answer didn't work in my case.

This problem had to do with the PyQt5 installation. The way to fix it was to uninstall it

pip uninstall PyQt5

and then Spyder launched perfectly