Adding a method to a class within a class

Question

Complete brain fart here and not even sure I am asking the right question. How do I add/change a method of a class that exists within a class?

I am building a QT GUI designed in QtDesigner. My Python program imports and makes a new class subclassed to the GUI file class. I want to change a method to a button within that class.

So basically I have the below, and I want to add a method to 'aButton'.

qtDesignerFile.py

class Ui_MainWindow(object): def setupUi(self, MainWindow): self.aButton = QtGui.QPushButton()

myPythonFile.py

import qtDesignerFile class slidingAppView(QMainWindow,slidingGuiUi.Ui_MainWindow): def __init__(self,parent=None): super(slidingAppView,self).__init__(parent)

Matthieu · Accepted Answer · 2013-03-19 00:10:27Z

To add to Joran's answer, methods added like this:

def foo(): pass instance.foo = foo

will act like static methods (they won't have the instance passed as first argument). If you want to add a bound method, you can do the following:

from types import MethodType def foo(instance): # this function will receive the instance as first argument # similar to a bound method pass instance.foo = MethodType(foo, instance, instance.__class__)

Joran Beasley · Accepted Answer · 2013-03-18 23:38:04Z

self.aButton.PrintHello = lambda : print "hello!"

or

def aMethod(): do_something() self.aButton.DoSomething = aMethod

either should work... probably more ways also ... this assumes aButton is a python class that inherits from Object

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