The biggest reason to use a list is to able to find objects by their position in the list. To do this, you use Python’s index notation: a number in brackets, starting at 0, that indicates the ...

Sorting a list in Python is simple, and you have two options: In-place: Modifies the list. Out-of-place: Returns a new list and doesn't modify the original list. The sort method is in-place, and it ...

The class internally uses a dictionary to store items, where each key is the item name and the value is the current quantity. The add_item method should add the given quantity of the given item and ...

Any mutable Python object doesn’t have a consistent hash value over its lifetime, and so can’t be used as a key. For instance, a list can’t be a key, because elements can be added to or ...

Working with files in Python is pretty easy. But there’s a common mistake that can sneak into your code. Not closing the file ...

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