How to create and use Qt Designer or Qt Creator to create a GUI for python.

pyqt6_workflow.md

• Create "ui" file in Qt Designer or Qt Creator.
• Run update_MainWindow.py which runs pyuic6 -o my_file.py <file>.ui and moves imports from the bottom to the top of the file, because promoted classes happen to be imported at the bottom for some reason which was causing an error.
• See files in this folder (e.g. file_loader.py) to see how to create/connect signals and slots.

update_MainWindow.py

#!py -3
''' Converts .ui file (outputted by Qt Designer) to .py file (for PyQt6) 
and imports from the bottom to the top of the file, because promoted 
classes happen to be imported at the bottom for some reason which was 
causing an error. '''

import os
import re
out_fname = 'MainWindow.py'

print( os.popen(f'pyuic6 mainwindow.ui -o {out_fname}').read() )

with open(out_fname) as f:
    lines = [line.rstrip() for line in f.readlines()]

lines_to_move = []
for line in reversed(lines):
    # if re.search(r'^from.+import', line):
    if line.startswith('from'):
        lines_to_move.append(line)
    else:
        break
for line in lines_to_move:
    lines.remove(line)

for i, line in enumerate(lines_to_move):
    lines_to_move[i] = re.sub('from ', 'from .', line)

lines = lines_to_move + lines

with open(out_fname, 'w') as f:
    f.write('\n'.join(lines))