Python

Slice: A partial element used to fetch a list or tuple; L = [' Michael ', ' Sarah ', ' Tracy ', ' Bob ', ' Jack ']l[0:3]       // Represents starting at index 0, up to index 3, but excluding index 3, which is index 0,1,2; exactly three elements;l[:3]

Jieba is a good Chinese word segmentation third-party libraryChinese text needs to get a single word through participleJieba is a good Chinese word segmentation third-party library, requires additional installation (PIP install Jieba)The Jieba

One: the definition of higher order functions:1) The parameter that the function accepts is a functional name2) The return value of the function is a functional name3) Any one of the above conditions can be called the higher order functionTwo:

Classes and Objects1. Classes and objects and concepts Class: The abstraction of a common thing, a description of a class of things that have a shared object, is a collection of the same properties and methods Object: An instance of a

　A: Decorative essence is a function, function is to add additional functions for other functionsII: Principle:1) Do not modify the source code of the modified function2) Do not modify the calling method of the modified functionThree: the

####################### Finishing ################## One, number# int (..)# Two, string# Replace/find/join/strip/startswith/split/upper/lower/format# tempalte = "I am {name}, age: {Age}"# # v = tempalte.format (name= ' Alex ', age=19)# v =

• Collection operations and their corresponding operator representationsThe collection is not inserted, only added, because after all the unordered#!/usr/bin/env python#-*-coding:utf-8-*-#Author:vergil Zhanglist_1= [1, 4, 5, 7, 3, 6, 7, 9]list_1=Set

While 1 n = while n : 3 print(n) 4 n+=15 Else: 6 print ("End of Loop") 7 Note: Else means that the following statement is executed when the condition is not satisfied For for in

Python Data Analysis Library-pandas:python data analysis Library https://pandas.pydata.org/ Pandas is an open source, bsd-licensed library providing high-performance, easy-to-use data structures and data a Nalysis Tools for the Python

‘‘‘The following Python code runtime environment is WINDOWS10,Python version is 3.5.3Libraries involved: Base64,json,unittest‘‘‘# Coding=utf-8# import Requests# import Hashlibimport base64, JSONImport UnitTestclass Demorequests (unittest.

Environment: Win10 python3.6First of all, the idea of arithmetic:First, the local phonetic library (without tones) is established. Use the greedy algorithm to scan the string from left to right, match the string to the local phonetic library

This series is intended to be documented in a number of interesting programs and summaries of them.Source of the problem:Https://github.com/Yixiaohan/show-me-the-codeHttps://github.com/HT524/500LineorLess_CNToday this program adds numbers to a

Implementation features: Enter user name and password Show welcome message after successful authentication Three-time error after locking 1 #prompt to enter user name and password2 3 #Verify user name and password4 #if error,

Brief introduction of UnitTest frameworkThe UnitTest unit test framework can be applied not only to unit testing, but also to the development and execution of automated test cases for Web UI and interface APIs that organize the execution of test

The first idea is to combine two numbers into an array and then sort them again, and the problem goes back to bubbling and fast, without the order of two arrays. BadThe second idea is to cycle through the size of the two ordinal array header

1. Create a process with fork (used in Linux)1 ImportOS2 #fork function, only shipped on UNIX/LINUX/MAC, Windows can not3PID =os.fork ()4 ifPID = =0:5 　　 Print(' hello--1')6 Else:7 　　 Print(' hello--2')When the program goes to Os.fork (), it

Sequential Lookup Two-point Search Practice First, sequential searchData=[1,3,4,5,6]value=1def Linear_search (data,value): flag=false for i in range (0,len (data)): if Data[i ]==value: # return I

Pyhton uses __new__ to create objects (__new__ is equivalent to building functions in Java),When the object is created, the __init__ method is called immediately to initialize the object, and the __init__ method has a parameter, self, is the object

1 #!/usr/bin/env python2 #-*-coding:utf-8-*-3 ############################4 #File Name:pi.py5 #Author:frank6 #Mail: [email protected]7 #Created time:2018-04-29 15:46:508 ############################9 Ten ImportRandom One Import Time A - #spigot

Import a new moduleCreate a calculate.py fileprint(‘ok‘)def add(x,y): return x + ydef sub(x,y): return x - yCreate a bin.py file again to call the calculate.py moduleimport sysimport calculate # 导入 calculate 模块, 模块会在 sys.path