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copied!<p>You don't call this method from an instance of <code>MyClass</code>, You call it from an instance of <code>MySubclass</code>. The problem is that you're probably getting a <code>TypeError</code> since the argument (self) that you're passing to <code>firstFunc</code> is the wrong type (<code>MyClass</code> instead of <code>MySubClass</code>). The solution is to restructure your code so this doesn't happen. At least, I assume that's the problem (when I tried you code, I got all sorts of import errors). Here's the code that I tried (which I assume illustrates the problem you're describing):</p> <pre><code>class MyClass(object): def uiFunc(self, MainWindow): self.attr1 = "foo" self.attr2 = "bar" def test(self): return MySubClass.firstFunc(self, 2, 2) class MySubClass(MyClass): def firstFunc(self, a, b): c = a + b d = self.secondFunc(c) #removed self from parameter list return d def secondFunc(self, c): d = c / 2 return d a=MyClass() b=MySubClass() print (b.test()) #this works because b is the right type to pass to first/second func a.test() #This doesn't work because a is the wrong type. </code></pre> <p>Notice that it doesn't really make sense to have <code>test</code> as a method of <code>MyClass</code> because you <strong>can't</strong> use it from there anyway. You might as well just move <code>test</code> onto <code>MySubClass</code>.</p> <p>Also, as others have noted, <code>self.secondfunc(self,c)</code> is also very strange. This is basically equivalent to <code>MySubClass.secondfunc(self,self,c)</code> which has the wrong number of arguments, as you're passing <code>self</code> twice.</p> <p>This works:</p> <pre><code>class MyClass(object): def uiFunc(self, MainWindow): self.attr1 = "foo" self.attr2 = "bar" def test(self): return firstFunc(self, 2, 2) def firstFunc(self, a, b): c = a + b d = secondFunc(self,c) #self from in front of function, now in parameter list return d def secondFunc(self, c): d = c / 2 return d class MySubClass(MyClass): firstFunc=firstFunc secondFunc=secondFunc a=MyClass() b=MySubClass() print (b.test()) print (a.test()) </code></pre> <p>But I highly recommend restructuring your code.</p>

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