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The __add__() method in Python is a special method that defines what happens when you add two objects with the + operator.
__add__ magic method is used to add the attributes of the class instance. For example, let's say object1 is an instance of a class A and object2 is an instance of class B and both of these classes have an attribute called 'a', that holds an integer.
The list() function creates a list object. A list object is a collection which is ordered and changeable.
consider the following code:
>>> x = y = [1, 2, 3, 4]
>>> x += [4]
>>> x
[1, 2, 3, 4, 4]
>>> y
[1, 2, 3, 4, 4]
and then consider this:
>>> x = y = [1, 2, 3, 4]
>>> x = x + [4]
>>> x
[1, 2, 3, 4, 4]
>>> y
[1, 2, 3, 4]
Why is there a difference these two?
(And yes, I tried searching for this).
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