I try to integrate it into the project in the simplest way without success, while outside I have no problem executing it Here is its implementation:

priorityContainer.py:

class priorityContainer(QListWidget):
def __init__(self):
    super().__init__()
    self.setIconSize(QSize(124, 124))
    self.setDragDropMode(QAbstractItemView.InternalMove)
    self.setDefaultDropAction(Qt.MoveAction) 
    self.setSelectionMode(QAbstractItemView.ExtendedSelection)
    self.setAcceptDrops(True)
    self.setDragEnabled(True)

    for i in range(12):
        QListWidgetItem( 'Item '+str(i), self)

main_interface.py:

from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys, os

from ressource.ResizableWindows import ResizableWindows
from ressource.Point import paintDot
from ressource.interface import tab_widget
from ressource.interface.error import messagederreur
from ressource.interface import priorityContainer

from ressource.camLabel import camLabel
from ressource.ToolsBar import toolsBar
import serveur.xmlrpc_server as xmlrpc_server
import memoire.XML_manager as XML_manager
import memoire.modele as modele
import socket

class UI_main(QMainWindow):
    def __init__(self):
         super(UI_main, self).__init__()
    
         qInstallMessageHandler(messagederreur)
         self.threadpool = QThreadPool()
    
         logo = QPixmap("Ressource/navigation/logo_icon.png")
         self.setWindowIcon(QIcon(logo))
    
         self.server_thread = xmlrpc_server.xmlrpc_server()
         self.server_thread.vid_thread.signals.connection.connect(self.vid_thread_connection)
         self.server_thread.signals.cmdSignal.connect(self.setCmdData)
         self.server_thread.vid_thread.signals.cmdSignal.connect(self.setCmdData)
    
         self.threadpool.start(self.server_thread)
         self.setupUi()
         self.show() 
         [...]

    def setupUi(self):
         self.centralwidget = QWidget(self)
         self.mainVcontainer = QVBoxLayout(self.centralwidget)
    
         self.detectionContainer = QWidget()
         self.detectionHContainer = QHBoxLayout(self.detectionContainer)
         self.dataCmdContainer = QVBoxLayout()
         self.dataOrderHContainer = QHBoxLayout()
         [...]
         self.priorityContainer = priorityContainer.priorityContainer()
         self.dataOrderHContainer.addLayout(self.dataVContainer)
         self.dataOrderHContainer.addWidget(self.priorityContainer)
                 
         self.dataCmdContainer.addLayout(self.dataOrderHContainer)   
         [...] 
         self.detectionHContainer.addLayout(self.dataCmdContainer)
    
         [...]
         self.mainVcontainer.addWidget(self.detectionContainer)
         self.setCentralWidget(self.centralwidget)

main.py:

from ressource.interface.main_interface import UI_main
from ressource.interface.Tuto import UI_tuto
import memoire.modele as modele
[...]

class Contr```
oller:
def init(self):

    modele.init()
    self.parameters = modele.model.globalParameters 
    [...]
def show_main(self):
    [...]
    self.parameters.save_parameters()
    self.UI_main = UI_main()
    [...]
[...]

def main():

app = QApplication(sys.argv)
controller = Controller()

myappid = 'mycompany.myproduct.subproduct.version'  # arbitrary string
ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID(myappid)

if controller.parameters.guide_done == 0:
    controller.show_tuto()
    sys.exit(app.exec_())
else:
    controller.show_main()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

I am also having problems with the QFileDialog where I have to use QFileDialog.DontUseNativeDialog to not crash the program