![]() Lists are an extremely flexible and useful data structure and many built-in methods and operations in Python produce lists as their output. Under the hood, lists are implemented as dynamic arrays - similar to Java's ArrayList type, and are most often used to store groups of similar data ( strings, numbers, sets etc.) of unknown length. List elements can be iterated over using the for item in construct.įor index, item in enumerate() can be used when both the element index and the element value are needed. Lists support both common and mutable sequence operations such as min()/ max(). ![]() Lists can be copied in whole or in part via slice notation or. Like any sequence, items can be accessed via 0-based index number from the left and -1-based index from the right. ![]() Like most collections ( see the built-ins tuple, dict and set), lists can hold reference to any (or multiple) data type(s) - including other lists. A list is a mutable collection of items in sequence.
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