I re-post my message...

@Marcus
Thanks for the information! Glad to know that I am on track, to be honest, 
I was not able to find much info online, perhaps my searching skill was not 
that great in this aspect :p

@Justin
Thanks for the code. I have decided to use your format for my code.

Even so, I have a few questions.
1. I tried writing a doc string, again I would like to have some insights 
if possible? Instead of writing it after the `init` function, I wrote it 
after the class statement, accordingly to what I have read online

2. Is there any chance that I will need to add in an `else` statement 
should the self.state not conform to either `self.STATE_ROOT_SELS` or 
`self.STATE_USER_SELS`? Otherwise, I suppose I can stopped such from 
happening in the run_dialog function, right?

class HierarchyDialog(QtGui.QDialog):
    """
    Keywords:
        state:
            Denotes the selection case - 'root node selection' or 'user 
based selection'
        STATE_ROOT_SELS :
            States the case if the selection is Root Node
        STATE_USER_SELS :
            States the case if the selection is User-based
    """


    
    # Documenting states
    STATE_ROOT_SELS = "root_sels"
    STATE_USER_SELS = "user_sels"




    def __init__(self, state, parent=None):
        QtGui.QDialog.__init__(self, parent)
        ...
        
        self.state = state


        if self.state == self.STATE_ROOT_SELS:
            # Run function_A()
        elif self.state == self.STATE_USER_SELS:
            # Run function_B()
        
        # Do I need to include in a bogus state if any of the above 2 
conditions are not met
        else:
            cmds.warning("Please have a valid selection")

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