How to correctly pass a function to another function in Python

Question

I am trying to assign a separate function to each instance that is created from bgImages, so that when I call instance.collisiontext, it calls that function. I feel like I am doing something wrong. If you look down in the build, you can see an example of where I create an instance and assign a function to collidetext.

The whole point of the collisiontext method is to call the function assigned to collidetext (which is going to be a different function for each instance).

What am I doing wrong here?

Also, when assigning a function to the instance slum, do I need to keep the '()' after 'slumnotice'?

class BgImages(ButtonBehavior, Image):
    def __init__(self, **kwargs):
        super(Npcs, self).__init__(**kwargs)
        self.collidetext=''

    def collisiontext(self,**kwargs):
        global collidetext
        return collidetext()

class MainCharacter(Image):

    def __init__(self, **kwargs):
        super(MainCharacter, self).__init__(**kwargs)
        self._keyboard = Window.request_keyboard(None, self)
        if not self._keyboard:
            return
        self._keyboard.bind(on_key_down=self.on_keyboard_down)
        self._keyboard.bind(on_key_up=self.on_keyboard_up)

    elif keycode[1] == 'up':
            for i in listofwidgets:
                if i.collide_point(self.x,self.top):
                    self.y -=1
                    i.collisiontext()

class gameApp(App):
    def build(self):
        slum=BgImages(source='slum.png', collidetext=slumnotice())
        listofwidgets=[]
        listofwidgets.append(slum)

Ignacio Vazquez-Abrams · Accepted Answer · 2014-04-27 06:35:32Z

1

What am I doing wrong here?

Quite a bit. It'll be easier if I just correct it and you figure out what I did after:

class BgImages(ButtonBehavior, Image):
    def __init__(self, **kwargs):
        self.collidetext = kwargs['collidetext']
        del kwargs['collidetext']
        super(BgImages, self).__init__(**kwargs)

    def collisiontext(self):
        return self.collidetext()

Also, when assigning a function to the instance slum, do I need to keep the '()' after 'slumnotice'?

That would depend on whether you want to use slumnotice itself or the return value of slumnotice().

answered Apr 27, 2014 at 6:35

Ignacio Vazquez-Abrams

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12 Comments

david Over a year ago

I'm not exactly sure what you did with kwargs['collidetext']

Ignacio Vazquez-Abrams Over a year ago

It's a dictionary. I accessed and mutated it.

david Over a year ago

Why? Anyway, that gives me error, 'KeyError: 'collidetext''

david Over a year ago

Can I just have the 'collidetext' be a placeholder for whatever function i assign to it (without having to delete things)?

Ignacio Vazquez-Abrams Over a year ago

Are you actually passing a "collidetext" argument to the constructor?

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