Скачать или смотреть How to Create BoxLayout in Kivy || Kivy with KS || Develop your App using Python+Kivy

In Kivy, a Python framework for developing multi-touch applications, you can create user interfaces using a language called KV language or by defining the UI directly in Python. Here, I'll provide an example of creating a boxlayout.
In Python, _init_ is a special method (sometimes referred to as a constructor) that is automatically called when an object is created. It is used to initialize the attributes of the object. The self parameter represents the instance of the object being created, and it is a convention to name it self although you could technically choose any name.

**kwargs is a special syntax in Python for passing a variable number of keyword arguments. The double asterisks (**) before kwargs indicate that any keyword arguments that are not explicitly named in the function signature will be collected into a dictionary called kwargs. This allows a function to accept an arbitrary number of keyword arguments without specifying them in advance.
Example:
class MyClass:
def __init__(self, **kwargs):
'self' refers to the instance of the object being created
'kwargs' is a dictionary containing any additional keyword arguments
self.some_attribute = kwargs.get('some_attribute', 'default_value')
self.another_attribute = kwargs.get('another_attribute', 42)

Example usage:
obj1 = MyClass()
obj1.some_attribute will be 'default_value' and obj1.another_attribute will be 42

obj2 = MyClass(some_attribute='custom_value', another_attribute=99)
obj2.some_attribute will be 'custom_value' and obj2.another_attribute will be 99