[Twisted-Python] how to use the twisted logging facility?

I've looked at the log module documentation of twisted.python and more or less guess that you can redirect the print statement to a log, and somehow observe the stuff that is being logged in case you want to write it somewhere else too. I was able to redirect the Python print statement to a disk file, but am at a loss when it comes to properly configuring and installing an observer. I want to observe the logging stream and throw it out to a Tkinter text window. Thanks in advance for any advice.