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NamedtupleFrom collections Import Namedtuplegirl = Namedtuple ("AAA", ["Name", "Age", "gender", "anime"]) girl = Girl (name= "Satori", a Ge=18, gender= "F", Anime= "Orient Spirit Hall") print (Girl) # aaa (name= ' Satori ', age=18, gender= ' f ', anime= ' Oriental Spirit Hall ') print ( Girl.name) # satoriprint (girl.age) # 18print (girl.anime) # Oriental Spirit Hall　　From collections Import Namedtupleg

This module implements a number of classes, which are very flexible. Can be used to replace Python's built-in dict, list, tuple, set type. And some features are not available for these built-in types.On the network to find some information, focusing on the collections module deque, Defaultdict, Counter class1. Class DequeSimilar to Python's built-in list, but it's a two-way list. Can be manipulated at any endHelp (Collections.deque)Class Deque (__buil

A Simple Analysis of the source code of the sort () method in Collections, collectionssort The sort method code of Collections: public static Definition of this method: This method is divided into three steps: (1) Replace list with an object Array (2) pass this object array to the sort method of the Arrays class (that is to say, the sort of collections act

Tags: when ... tar explicit IMU one database following BSPMongoDB stores BSON documents, i.e. data records, in collections; The collections in databases. DatabasesIn MongoDB, databases hold collections of documents. To select a database to use, in the MONGO Shell, issue the use statement, as in the following Example Use MyDBCreate a DatabaseIf A database does n

the symbol +>>> tup1 = (‘this‘,‘is‘,‘aaaa‘)>>> tup2 = (1,2,3,4)>>> tup3 = tup1 + tup2>>> tup3(‘this‘, ‘is‘, ‘aaaa‘, 1, 2, 3, 4)(4). Member OperatorsAs with lists, use symbols: in vs. not in>>> tup3(‘this‘, ‘is‘, ‘aaaa‘, 1, 2, 3, 4)>>> ‘aaaa‘ in tup3True>>> 2 in tup3True>>> 4 not in tup3False5. Meta-set built-in functions The Python tuple contains the following built-in functions Method Description Len (tuple) Counts the number of tuple eleme

Counter is a special kind of dictionary, which is mainly convenient for counting, the key is to count the number of Item,value saved. From collections import Counter >>> c = Counter (' Hello,world ') Counter ({' L ': 3, ' O ': 2, ' E ': 1, ' d ': 1, ' H ': 1, ', ': 1, ' R ': 1, ' W ': 1} Initialization can pass in three types of parameters: dictionaries, other iterable data types, and named parameter pairs. | __init__ (self, I

This article describes how to use the Python built-in module collections. the sample code is based on Python 2.x. if you need it, refer to collections as a collection module built in Python, provides many useful collection classes. Namedtuple We know that tuple can represent the unchanged set. for example, the two-dimensional coordinates of a point can be expressed: >>> p = (1, 2) However, when we see (

There are some of the more useful types in the collections module, which are some of the basic types of extensions that are necessary for one of the modules Counter (counter) Can track the number of occurrences of a value, and is arranged from large to small>>> Import collections>>> C1 = collections. Counter (' ADADWEFFFCVCC ') >>> c1counter ({' C '

Nonsense opening To meet project requirements, you need to systematically Understand Java Collections. Therefore, you can easily record and serve others.Java Collections The Java Collections framework consists of four parts: interfaces, implementations, aggregate operations, and algorithms. Subsequent articles will also introduce these four parts separately.Java

This article mainly introduces the use of Python's built-in module collections tutorial, the sample code based on the python2.x version, the need for friends can refer to the Collections is a collection module built in Python that provides a number of useful collection classes. Namedtuple We know that tuple can represent invariant sets, for example, the two-dimensional coordinates of a point can be expre

Python learning-collections series, pythoncollections I. counter (counter) Counter is a supplement to the dictionary type and is used to track the number of occurrences. ps: it has all the functions of the dictionary + its own functions.Example:>>> From collections import Counter>>> C = Counter ('adsassdsdads ')>>> Print (c)Counter ({'A': 4, 'D': 4, 's': 5 })Basic operation method: >>> C = Counter ('abcdeab

In this "Java 8 new features tutorial" series, we'll dive into the code to show you how to iterate through a collection through a stream, how to create a stream from a collection and an array, and how to aggregate the value of a stream.In the previous article, "Traversing, filtering, working with collections, and using lambda expression enhancement methods," I've explained and demonstrated the use of lambda expressions and method references to iterate

) Akey;7.> Remove all key-value pairs from the dictionary-(void) removeallobjects;Collections: Collections are used in the development process and do not have arrays and dictionaries frequently. The set of OC is divided into immutable set (Nsset) and mutable set (Nsmutableset).Features of the collection:No two identical objects can exist in a cross-specific setThe objects in the unordered collection are not

Python full stack Development 5. Several Common sorting algorithms and the data structure provided by the collections module, pythoncollections During the interview, I often encounter some questions about the sorting algorithm. Here, I simply listed several of the most common sorting algorithms for you to learn. Maybe the interview will be useful in the future, the second half of this article introduces the collec