Python: combine logging and wx so that logging stream is redirectet to stdout/stderr frame
- by Uwe
Here's the thing:
I'm trying to combine the logging module with wx.App()'s redirect feature. My intention is to log to a file AND to stderr. But I want stderr/stdout redirected to a separate frame as is the feature of wx.App.
My test code:
import logging
import wx
class MyFrame(wx.Frame):
def __init__(self):
self.logger = logging.getLogger("main.MyFrame")
wx.Frame.__init__(self, parent = None, id = wx.ID_ANY, title = "MyFrame")
self.logger.debug("MyFrame.__init__() called.")
def OnExit(self):
self.logger.debug("MyFrame.OnExit() called.")
class MyApp(wx.App):
def __init__(self, redirect):
self.logger = logging.getLogger("main.MyApp")
wx.App.__init__(self, redirect = redirect)
self.logger.debug("MyApp.__init__() called.")
def OnInit(self):
self.frame = MyFrame()
self.frame.Show()
self.SetTopWindow(self.frame)
self.logger.debug("MyApp.OnInit() called.")
return True
def OnExit(self):
self.logger.debug("MyApp.OnExit() called.")
def main():
logger_formatter = logging.Formatter("%(name)s\t%(levelname)s\t%(message)s")
logger_stream_handler = logging.StreamHandler()
logger_stream_handler.setLevel(logging.INFO)
logger_stream_handler.setFormatter(logger_formatter)
logger_file_handler = logging.FileHandler("test.log", mode = "w")
logger_file_handler.setLevel(logging.DEBUG)
logger_file_handler.setFormatter(logger_formatter)
logger = logging.getLogger("main")
logger.setLevel(logging.DEBUG)
logger.addHandler(logger_stream_handler)
logger.addHandler(logger_file_handler)
logger.info("Logger configured.")
app = MyApp(redirect = True)
logger.debug("Created instance of MyApp. Calling MainLoop().")
app.MainLoop()
logger.debug("MainLoop() ended.")
logger.info("Exiting program.")
return 0
if (__name__ == "__main__"):
main()
Expected behavior is:
- a file is created named test.log
- the file contains logging messages with level DEBUG and INFO/ERROR/WARNING/CRITICAL
- messages from type INFO and ERROR/WARNING/CRITICAL are ether shown on the console or in a separate frame, depending on where they are created
- logger messages that are not inside MyApp or MyFrame are displayed at the console
- logger messages from inside MyApp or MyFrame are shown in a separate frame
Actual behavior is:
- The file is created and contains:
main INFO Logger configured.
main.MyFrame DEBUG MyFrame.__init__() called.
main.MyFrame INFO MyFrame.__init__() called.
main.MyApp DEBUG MyApp.OnInit() called.
main.MyApp INFO MyApp.OnInit() called.
main.MyApp DEBUG MyApp.__init__() called.
main DEBUG Created instance of MyApp. Calling MainLoop().
main.MyApp DEBUG MyApp.OnExit() called.
main DEBUG MainLoop() ended.
main INFO Exiting program.
- Console output is:
main INFO Logger configured.
main.MyFrame INFO MyFrame.__init__() called.
main.MyApp INFO MyApp.OnInit() called.
main INFO Exiting program.
- No separate frame is opened, although the lines
main.MyFrame INFO MyFrame.__init__() called.
main.MyApp INFO MyApp.OnInit() called.
shouldget displayed within a frame and not on the console.
It seems to me that wx.App can't redirect stderr to a frame as soon as a logger instance uses stderr as output. wxPythons Docs claim the wanted behavior though, see here.
Any ideas?
Uwe
