Lists store ordered mutable data
Lists are the standard choice when you need an ordered collection that can grow or change. They support indexing, slicing, iteration and methods for adding, removing and sorting values.
Important list operations
append() adds one value, extend() adds multiple values, insert() places a value at a position, pop() removes and returns an item, and remove() deletes the first matching value.
References and copying
Assigning one list to another variable does not copy the data; both names reference the same list. Use copy() for a shallow copy and understand that nested mutable objects are still shared.
Practice: build a shopping cart, add and remove products, calculate its total and create a sorted view without unexpectedly changing the original order.
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