Lists and Tuples in Python

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A Python list is a mutable sequence container that stores values of any type, including mixed types. It is written inside square brackets [ ]. Example: [10, 20, 'A'] can store numbers and text togethe…

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Lists are called mutable because their elements can be changed after the list is created. A value can be updated, added, or removed without making a new list.

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A tuple is an immutable collection of items enclosed within round brackets ( ). It can be empty, and it can contain values of different types. Once created, its elements cannot be changed or partially…

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Indexing starts at 0 for both lists and tuples. The first item has index 0, the second has index 1, and so on.

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Negative indexing counts from the end of the sequence. -1 refers to the last item, -2 to the second last item, and so on.

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Slicing means taking a part of a sequence using start, stop, and step values. The syntax is seq = L [start: stop: step]. Start, stop, and step are all optional. The default step is 1.

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list[n:m] returns elements starting from index n and ending before index m. It includes the first index but excludes the last, so it gives m-n elements.

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list[::2] produces a list with every alternate element. It skips one element each time because the step value is 2.