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To include a __getitem__ method as an accessor to a class in Python, you need to define the method inside the class definition. Here's an example:

class MyClass:
    def __init__(self, data):
        self.data = data

    def __getitem__(self, key):
        return self.data[key]

In this example, the __init__ method initializes the instance variable data with the given data. The __getitem__ method returns the value of the data instance variable at the given index, which is specified by the key parameter.

Now you can create an instance of the class and access its data using the square bracket notation, like this:

my_obj = MyClass([1, 2, 3, 4])
print(my_obj[2])   # Output: 3

In this example, my_obj[2] will access the third element of the data list, which is 3.