PyQt5 not found by Python3.7

Question

I installed Python 3.7 on my raspberry pi with the help of Installing Python 3.7.0 on Raspbian tutorial and wanted to use it to start my script which uses PyQt5 but its throwing a ModuleNotFoundError. PyQt5 is installed and working with 3.4.2 why is it not working with 3.7 ?

Traceback (most recent call last):
  File "gui.py", line 8, in <module>
    from PyQt5 import QtCore, QtGui, QtWidgets
ModuleNotFoundError: No module named 'PyQt5'

Thanks in advance for any kind of help !

Answer 1

You can't install an out-of-distribution Python version and expect system Python packages to work. They're compiled for Python 3.5 that's included in the distribution.

I suggest you upgrade to Buster (unreleased/testing) to get system Python 3.7 and PyQt from the distribution.

To upgrade to Buster, edit /etc/apt/sources.list and replace stretch with buster on both lines, then run apt update and apt dist-upgrade.