Web Reference: Apr 14, 2025 · Learn how to add elements to an array in Python using append (), extend (), insert (), and NumPy functions. Compare performance and avoid common errors. To initialize an empty list do this: or. To add elements to the list, use append. To extend the list to include the elements from another list use extend. To remove an element from a list use remove. Dictionaries represent a collection of key/value pairs also known as an associative array or a map. To initialize an empty dictionary use {} or dict() 1 day ago · You can’t use lists as keys, since lists can be modified in place using index assignments, slice assignments, or methods like append() and extend(). It is best to think of a dictionary as a set of key: value pairs, with the requirement that the keys are unique (within one dictionary).
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