Python MultiDict Examples: Map One Key to Multiple Values
Use the Python multidict library to map one key to several values. Add, getall, update, popall, CIMultiDict for headers, and defaultdict(list) compared.
Python data types and collections, including strings, integers, lists, tuples, dictionaries, sets, OrderedDict, priority queues and MultiDict, with all methods and return values. See the Python tutorial index for every topic.
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Tutorials
Python Set: Operations, Methods and frozenset Examples
Learn Python sets with examples. Add and remove items, union, intersection and difference with operators, every set method and its return value, frozenset.
Python Dictionary: Create, Access, Update and Methods
Learn the Python dictionary with examples. Create, read with get(), add, update, merge with |, delete and iterate, and every dict method with return value.
Python Tuple: Create, Access, Unpack and Tuple Methods
Learn the Python tuple with examples. Create one-element tuples, index and slice, sort, unpack with *rest, use named tuples, count(), index() and keys.
Python List: Create, Add, Remove, Sort and List Methods
Learn Python lists with examples. Create, index and slice, add and remove items, join lists, sort and copy, and every list method with its return value.
Python Strings: Slicing, Formatting and All String Methods
Learn Python strings with examples. Slicing, f-strings, immutability and join(), plus all 47 string methods with return values, capitalize() to zfill().
Python Integer (int): Operations, Conversion and Limits
Learn the Python integer (int) type. Hex and binary literals, floor division of negatives, int() and str() conversion, the 4300-digit limit and bit tools.
Python OrderedDict vs dict: When You Still Need It
Python dict keeps insertion order since 3.7. Learn when OrderedDict still helps with move_to_end(), popitem(last=False), equality and an LRU cache.
Python Priority Queue using heapq, queue and bisect
Build a priority queue in Python with heapq, queue.PriorityQueue and bisect. Handle ties with a counter, use 3.14 max-heap functions and schedule tasks.
