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  • Ignatius Verbeek thinks this is interesting:

pyuic4 -o ui_myplugin.py ui_myplugin.ui

From

Cover of QGIS Python Programming Cookbook - Second Edition

Note

should be ui_myplugin.ui ui_myplugin.ui

file names in the wrong order see https://gis.stackexchange.com/questions/217373/creating-a-qgis-plugin-with-plugin-builder-recipe-from-qgis-python-programming