Unable to select id for animation in Kivy

I have a kv segment that is inside my Python code.

What I want to do is select this button and animate it. The animation itself is triggered by clicking NoButton

. NoButton

has a class that is a child of the root widget class. Unfortunately, even though I was able to successfully reference the id from the kv code, I cannot seem to use it.

Pressing NoButton

does absolutely nothing. No mistakes, nothing. If I try to print the ID, then I get the location of the referenced button:

<__main__.MainButton object at 0x7fd5db0d5590>

Here is the kv code snippet:

<MainClass>:
<MainScreen>:
    id: main

    AnchorLayout:
        size: root.size
        anchor_x: 'center'
        anchor_y: 'center'
        padding: 0, 0, 0, 50
        MainButton:
            id: pics
            rgba: 1,5,1,1
            size_hint_x: None
            size_hint_y: None
            height: main.height / 1.5
            width: main.width / 1.5 

      

        
        
        
      

    

and python:

class MainScreen(Screen):
    pass

class MainButton(Button):
    pass

class NoButton(ButtonBehavior, Image, MainClass):
    def on_press(self):     
        anim = Animation(x=300, y=300)
        anim.start(MainButton())
        print(MainScreen().ids.pics)

      

        
        
        
      

    

You will notice that it is anim.start

referring to the class, not the id. Unfortunately, it gives the same result; nothing.

Creating pics

an object as a property and declaring that in kv doesn't work either.

I really don't know at all. I have looked at a few questions that are a bit similar, but really not many when it comes to help / guides for advanced kiwi development.

I am using Python 3.5.3 and Kivy 1.9.2-dev0

Would appreciate any help / tips or pointers in the right direction :)