thank you.
then a basic python question.
how does queryset implement it?
does python also allow operator (e.g. []) overloading?
It's not usually called overloading in Python, but yes. Classes can define a `__getitem__` method which determines what to do when the square-bracket notation is used. You can see the code here:
https://code.djangoproject.com/browser/django/trunk/django/db/models/query.py#L165
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