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Notes/20250804214537-python_set.org

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+:PROPERTIES:
+:ID:       3a41407c-661e-416a-80d2-4c7a137d153a
+:END:
+#+title: python-set
+#+filetags: :python:notes:
+
+Sets are used to store multiple items in a single variable.
+
+Set is one of 4 built-in data types in Python used to store collections of data, the other 3 are List, Tuple, and Dictionary, all with different qualities and usage.
+
+A set is a collection which is unordered, unchangeable*, and unindexed.
+
+*Note: Set items are unchangeable, but you can remove items and add new items.
+
+Sets are written with curly brackets.
+Example:
+
+#+begin_src python
+  # Create a Set:
+  thisset = {"apple", "banana", "cherry"}
+  print(thisset) 
+#+end_src
+
+Notes:
+
+Sets are fast, Note that empty Set cannot be created through {}, it creates a dictionary, unless you include values.
+set is implemented as a hash table, so you can expect lookup, insert, delete to be O(1) on average.