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Hace 2 días · Learn how to use the collections module to create and manipulate different types of containers, such as namedtuples, deques, Counters, OrderedDicts, and ChainMaps. See examples, methods, and properties for each class and how to chain mappings.
Learn how to use the collections module in Python to create and manipulate various data structures and classes for specific programming problems. Explore examples of namedtuple, deque, defaultdict, OrderedDict, Counter, ChainMap, and more.
Aprende a usar el módulo collections para crear y manipular tuplas, diccionarios y listas en Python 3. El tutorial explica las clases namedtuple, defaultdict y deque con ejemplos prácticos y código.
Learn how to use the collections module to create specialized containers such as namedtuples, deques, ChainMaps, Counters, OrderedDicts, defaultdicts, UserDicts, UserLists, and UserStrings. See examples, methods, and recipes for each class.
- Counters
- OrderedDict
- Defaultdict
- ChainMap
- Namedtuple
- Deque
- UserDict
- Userlist
- UserString
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A counteris a sub-class of the dictionary. It is used to keep the count of the elements in an iterable in the form of an unordered dictionary where the key represents the element in the iterable and value represents the count of that element in the iterable. Note: It is equivalent to bag or multiset of other languages. Syntax:
An OrderedDict is also a sub-class of dictionary but unlike dictionary, it remembers the order in which the keys were inserted. Syntax: Example: Output: While deleting and re-inserting the same key will push the key to the last to maintain the order of insertion of the key. Example: Output: Note: for more information, refer OrderedDict in Python
A DefaultDictis also a sub-class to dictionary. It is used to provide some default values for the key that does not exist and never raises a KeyError. Syntax: default_factory is a function that provides the default value for the dictionary created. If this parameter is absent then the KeyError is raised.
A ChainMapencapsulates many dictionaries into a single unit and returns a list of dictionaries. Syntax: Example: Output:
A NamedTuplereturns a tuple object with names for each position which the ordinary tuples lack. For example, consider a tuple names student where the first element represents fname, second represents lname and the third element represents the DOB. Suppose for calling fname instead of remembering the index position you can actually call the element ...
Deque (Doubly Ended Queue)is the optimized list for quicker append and pop operations from both sides of the container. It provides O(1) time complexity for append and pop operations as compared to list with O(n) time complexity. Syntax: This function takes the list as an argument. Example: Output:
UserDictis a dictionary-like container that acts as a wrapper around the dictionary objects. This container is used when someone wants to create their own dictionary with some modified or new functionality. Syntax: Example: Output: Note: For more information, refer UserDict in Python
UserList is a list like container that acts as a wrapper around the list objects. This is useful when someone wants to create their own list with some modified or additional functionality. Syntax: Example: Output: Note:For more information, refer UserList in Python
UserStringis a string like container and just like UserDict and UserList it acts as a wrapper around string objects. It is used when someone wants to create their own strings with some modified or additional functionality. Syntax: Example: Output: Note:For more information, refer UserString in Python
Learn about different types of containers provided by the collections module in Python, such as Counter, OrderedDict, DefaultDict, ChainMap, etc. See syntax, examples, and output for each container.
collections — Tipos de datos contenedor ¶. Source code: Lib/collections/__init__.py. Este módulo implementa tipos de datos de contenedores especializados que proporcionan alternativas a los contenedores integrados de uso general de Python, dict, list, set, and tuple. Objetos ChainMap ¶. Nuevo en la versión 3.3.
16 de feb. de 2021 · El módulo collections de Python tiene diferentes tipos de datos especializados que funcionando como contenedores y que pueden utilizarse para reemplazar los contenedores de propósito general de Python (`dict`, `tuple`, `list` y `set`).
