Spyder doesn't start - no module named 'PyQt5.QtWebEngineWidgets'

Problem Description

I recently installed Python and Spyder in my computer, but Spyder doesn’t start.

What steps reproduce the problem?

1. Download and Install Python 3.7.2
2. Open cmd
3. pip install spyder
4. python
5. import spyder; spyder.app.start.main()

What is the expected output? What do you see instead?

Expected opening the GUI, but error occurred.

Paste Traceback/Error Below (if applicable)

Traceback (most recent call last):
  File "C:\Python37\lib\site-packages\qtpy\QtWebEngineWidgets.py", line 22, in <module>
    from 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 "<stdin>", line 1, in <module>
  File "C:\Python37\lib\site-packages\spyder\app\start.py", line 178, in main
    from spyder.app import mainwindow
  File "C:\Python37\lib\site-packages\spyder\app\mainwindow.py", line 90, in <module>
    from qtpy import QtWebEngineWidgets  # analysis:ignore
  File "C:\Python37\lib\site-packages\qtpy\QtWebEngineWidgets.py", line 26, in <module>
    from PyQt5.QtWebKitWidgets import QWebPage as QWebEnginePage
ModuleNotFoundError: No module named 'PyQt5.QtWebKitWidgets'

Versions

• Spyder version: 3.3.3
• Python version: 3.7.2 64-bit
• Qt version: 5.10.0
• PyQt version: 5.12
• Operating System name/version: Windows 10

Dependencies

IPython >=4.0     :  7.2.0 (OK)
cython >=0.21     :  0.29.6 (OK)
jedi >=0.9.0      :  0.13.2 (OK)
matplotlib >=2.0.0:  3.0.2 (OK)
nbconvert >=4.0   :  5.4.0 (OK)
numpy >=1.7       :  1.15.4 (OK)
pandas >=0.13.1   :  0.24.1 (OK)
pycodestyle >=2.3 :  2.5.0 (OK)
pyflakes >=0.6.0  :  2.1.0 (OK)
pygments >=2.0    :  2.3.1 (OK)
pylint >=0.25     :  2.2.2 (OK)
qtconsole >=4.2.0 :  4.4.3 (OK)
rope >=0.9.4      :  0.11.0 (OK)
sphinx >=0.6.6    :  1.8.3 (OK)
sympy >=0.7.3     :  1.3 (OK)

Solution

I managed to fix it, by installing an older version of PyQt5, following this discussion on Stack Overflow: https://stackoverflow.com/questions/51154871/python-3-7-0-no-module-named-pyqt5-qtwebenginewidgets

pip install PyQt5==5.10

[ccordoba12]

Thanks for reporting. This is a duplicate of issue #8747 and it’ll be fixed in our next version (3.3.4).

For now you can run

pip install pyqtwebengine

to get the fix.

[BartBruininks]

Actually you need to uninstall it first: pip uninstall pyqtwebengine pip install pyqtwebengine

This solved it for me.