Sharing methods between classes

[hughesadam_87]

Hey everyone, this should be simple, but I keep running into errors so help is greatly appreciated.

I have a large class, call it class A, which has several methods. Most of these methods modify data.

ClassA()
def __init(X,Y,Z)
...
..

def data_mod1():
...

def data_mod2():
...

I'm dealing with a large GUI program, which has several connected buttons. Therefore, I have another class to do nothing but handle button operations. Most of these operations are stylistic (changing colors and names). For example:

class Button_manager()

def color_style1():
....

def attribute_style1():
....

Here is the issue. At some point, it is advantageous to change the data at the level of the button_manager. Therefore, I need to borrow a method from ClassA. For example, the method

def data_mod1():

Ought to be callable from the button_manager or ClassA. I can't for the life of me get this to work though. I've tried following example on inheritance and stuff, but because the Button_Manager class is called through ClassA, it seems to give me issues. Basically, how do I load Button_Manager to share this method.

[TrustyTony]

You are calling the __init__ of inherited class in beginning of child __init__ , aren't you? Could you post restricted example with only the problem behaviour?

[hughesadam_87]

You are calling the __init__ of inherited class in beginning of child __init__ , aren't you? Could you post restricted example with only the problem behaviour?

Thanks tony. I don't quite understand what that means. Can you post a quick metacode example, and then I'll put it into my code and post the restricted example? Sorry for my idiocy.

[Gribouillis]

The easiest solution is to have both Class A and Button_Manager inherit a common superclass which holds their common methods

class Common(object):
    def data_mod1(self):
        ...

class A(Common):
    ...

class Button_Manager(Common):
    ...

[TrustyTony]

I am newbie myself in this stuff having grown more with procedural and functional structured/modular programming, but I contrived this example, let the experts correct me:

class Funny(object):
    def __init__(self, content):
        self.content = content

    def justify(self, width=40):
        return str(self).rjust(width)

    def __str__(self):
        return ' '.join(str(c) for c in self.content)

class More_funny(Funny):
    def __init__(self, *args, **kwargs):
        Funny.__init__(self, args)
        self.times = kwargs['times']

    def many_times(self):
        return self.times * self.justify()

    def center(self, width=60):
        return str(self).center(width)


donald = Funny(('Donald', 43534))
duck = More_funny('Duck', 313, times = 13)

print(donald.justify())
print(duck)
print(duck.justify(20))
print(duck.center(60))
print(str(duck.center(80)).upper())
print(duck.many_times())

[hughesadam_87]

Thanks a lot guys. Let me play with the suggestions you've posted and see if I can get my stuff straightened out.

[hughesadam_87]

Thanks for the help guys. The method that Griboullis suggested seems to work with my code as it is. The other method doesn't work, but it's because I am using Tkinter and all of the pre-defined control variables produce this error:

Exception _tkinter.TclError: 'can\'t unset "PY_VAR1386": no such variable' in <bound method IntVar.__del__ of <Tkinter.IntVar instance at 0xc297e2c>> ignored

This is probably my fault, since I don't have a strong grasp on inheritance so I don't really know what I'm doing. Thanks both of you for your help.

[TrustyTony]

As mentioned in recent post by Grib tk interface may still be old style classes