Printing to a "log screen" in a multi-module QT app

[Bjorn Pettersen]

> From: Anders Schneiderman [mailto:schneida at seiu.org] 
> 
> I'm writing an application using QT.  Right now when I want 
> to use the equivalent of "print", I call a method called 
> "log" that's defined in the main class in my main module:
> 
> def log(self, msg):
>    try:
>       self.logArea.insertline(msg, -1)
>    except:
>       self.logArea.insertline(str(msg), -1)
> 
> To call it in other classes that are in other modules of the 
> app, I pass "log" to the new class.  For ex:
> 
> class CodeEditor:
>    def __init__ (self, log, ...)
>        self.log = log
> 
> Is there a cleaner way to do this?  For example, is there a 
> way to redefine the "print" command?  Whatever solution I 
> come up with, the command to print has to be short;  
> "self.logObject.log('File successfully updated')" is too much 
> of a pain.  Any suggestions?

You could do something like:

  class Logger:
      def __init__(self, logArea):
          self.logArea = logArea

      def write(self, msg):
          try:
             self.logArea.insertline(msg, -1)
          except:
             self.logArea.insertline(str(msg), -1)

Then you can pass an instance of the Logger class around and simply do:

   print >> logger, 'hello world'

-- bjorn