[Tutor] How to access a method defined in one class from another class (which is a thread) in Python3?

[SM]

I am defining multiple classes (some of them are threads)
I have been writing Python programs for a few months, but never faced this
issue so far unless I am doing something different inadvertently. The only
difference I see is that I am calling the methods belonging to other
classes, from a class which is also a thread.
 I see the following error:

AttributeError: 'Ui_MainWindow' object has no attribute
'textEdit_fwcmdlineoutput'

Code Snippets:

class Ui_MainWindow(object):
    [snip]

    def setStdoutToTextEditWindowFw(self):
          self.textEdit_fwcmdlineoutput.setText( sys.stdout.getvalue() )
          sys.stdout = self.oldstdout

Calling the above method from within the class works fine. But I am calling
it from another class as below:

class bcThread(threading.Thread):
    def __init__(self, cmd):
        threading.Thread.__init__(self)
        self.cmd = cmd
    def run(self):
        [snip]
        Ui_MainWindow.setStdoutToTextEditWindowFw(Ui_MainWindow)

The highlighted line gives the following error :


Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.2/threading.py", line 740, in _bootstrap_inner
    self.run()
  File "bc_reports_tab.py", line 1299, in run
    Ui_MainWindow.setStdoutToTextEditWindowFw(Ui_MainWindow)
  File "bc_reports_tab.py", line 465, in setStdoutToTextEditWindowFw
    self.textEdit_fwcmdlineoutput.setText( sys.stdout.getvalue() )
AttributeError: type object 'Ui_MainWindow' has no attribute
'textEdit_fwcmdlineoutput'

I also tried many different ways of calling the method. The highlighted
line is one of them. Another one I tried is here where I create an
instance, which also gives the same error:

x = Ui_MainWindow()
x.setStdoutToTextEditWindowFw()

I see the same error.
Can someone guide me as to what is the correct way to do something like
this?


Thanks in advance.
-SM
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