How to debug a QGIS python plugin with popups?

Question

I'm trying to write a python plugin for QGis. I'd like to debug some DB queries and I need a way to display the result.

I thought about using a popup to display it, but I don't know how to show a popup from inside a python plugin.

Can anyone suggest me how to do that?

Answer 1

Finally I solved this way:

def printMsg(self,msg):
    QMessageBox.information(self.iface.mainWindow(),"Debug",msg)

I don't know if it's the best way to go, but it seems to work fine.

Answer 2

I've ended up using the print out messages way as well except I set up a variable (global?) that I can turn off when I release the plugin, PluginMsgTxt is the name of the plugin - which I use for info messages, warnings etc as well

InDebugMode = True

def debugMsg(self, InDebugMode, PluginMsgTxt, msg):
   #this will print nothing if InDebugMode is false
   if InDebugMode:
       iface.messageBar().pushMessage("MAINDEBUG: ", msg, level=Qgis.Info, duration = 1)

Answer 3

Instead of pop-ups, I recommend using the First Aid plugin.

Provides Python debugger and replaces the default Python error handling in QGIS with a more sophisticated handler that allows more thorough inspection or the Python error: browse the frames, view variables, see source code or even execute Python code within the context of the error.