: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.