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I am in my first steps in PyQt and I face difficulties in how to run the following code within QGIS console. I want to create a simple window, but nothing happens. I change main by console and then QGIS crashes. Any help is welcome.
import sys
from PyQt5.QtWidgets import QApplication, QWidget
def main():
app = QApplication(sys.argv)
w = QWidget()
w.resize(250, 150)
w.move(300, 300)
w.setWindowTitle('Simple')
w.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
In QGIS you can't use an application object, because qgis itself is a QtApplication. Try to execute lines 6-10 alone and you'll see a widget on the screen. To have a full functional dialog, you'll need to a have something like a qgis-plugin. To work with pyqt only, try an standalone python shell or an ide.
For plugin creation, you use the qgis plugin "plugin builder", there is also a tutorial on this topic (http://www.qgistutorials.com/de/docs/building_a_python_plugin.html), but it doesn't cover qgis3 (some steps are different). But Plugin Builder will guide you through the process...
