How To Create A Loading Warning For Long Processing Thread On Python?

I'm fairly new to python(only couple weeks learning) and I'm finishing my first application using python 3.6 and Pyqt5 for GUI. It consists in a blockchain wallet for my boss' comp

Solution 1:

For this type of tasks you can use a QProgressDialog, in the following part there is an example:

import sys
import time
import thread

from PyQt5.QtCore import QObject, pyqtSignal, Qt
from PyQt5.QtWidgets import QWidget, QVBoxLayout, QPushButton, QInputDialog, QApplication, QProgressDialog

class Message(QObject):
    finished = pyqtSignal()

def createAddress(password, name, obj):
    time.sleep(5)
    obj.finished.emit()


class Widget(QWidget):
    def __init__(self, *args, **kwargs):
        QWidget.__init__(self, *args, **kwargs)
        lay = QVBoxLayout(self)
        button = QPushButton("Start processing")
        lay.addWidget(button)
        button.clicked.connect(self.start_task)
        self.message_obj = Message()

    def start_task(self):
        password = "password"
        name, ok = QInputDialog.getText(None, 'Name the address', 'Enter the address name:')
        if ok:
            self.progress_indicator = QProgressDialog(self)
            self.progress_indicator.setWindowModality(Qt.WindowModal)
            self.progress_indicator.setRange(0, 0)
            self.progress_indicator.setAttribute(Qt.WA_DeleteOnClose)
            self.message_obj.finished.connect(self.progress_indicator.close, Qt.QueuedConnection)
            self.progress_indicator.show()
            thread.start_new_thread(createAddress, (password, name, self.message_obj))


if __name__ == '__main__':
    app = QApplication(sys.argv)
    app.setStyle("fusion")
    w = Widget()
    w.show()
    sys.exit(app.exec_())