python2 is not relevant, since krop is python3 only.
The problem can be narrowed down to this code:

 echo -e  "from popplerqt5 import Poppler" | python3.7

On my system it loads python3-pyqt5 libs from 
/usr/lib/python3/dist-packages/PyQt5.
May be try to play with PYTHONPATH to force python3 to pickup modules from 
/usr/lib/python3. Also in general I'd suggest to avoid using pip as root, 
install python modules locally with --user flag.

Best,
Alex

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https://bugs.launchpad.net/bugs/1864637

Title:
  krop and dependencies installs without error, but does not run

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