introduction to computation and programming using python pdf

then reverse once again function len () Calculates the list length, which is the number of elements in the list The number of calculated list elements is starting from 1, and several are Example: Len (names) calculates the number of elements in the list names, and returns 5 if there are 5 elements. using (-1) The method of accessing the last element will cause an error only if the list is empty, otherwise this

This article mainly introduces how to use the join function in python multi-threaded programming. This article first provides examples of using the join function and summarizes the use of the join function, if you need it, you can refer to the next day to buy bags in Xinji. it will be back late in the afternoon. it is disgusting and a headache. It's disgusting be

follows:Closemainsystem = "Turn off human interaction" Openeclipse = "I want to write a program" Listenmusic = "I'm so tired." Blog = "Read Blog" php = "PHP" java = "Java" 2. Defining relevant semantic operational logicCopy the Code code as follows:Defcallback (phrase, listener): Print (":%s"%phrase) Ifphrase ==closemainsystem: Speech.say ("Goodbye. Human-Computer Interaction will close, thank you for using ") Listener.stoplistening () Sys.exit ()

Example of using the modifier in Python Programming Decoration functions and methods We first define two simple mathematical functions, one for calculating the sum of squares and the other for calculating the square difference: # get square sumdef square_sum(a, b): return a**2 + b**2# get square diffdef square_diff(a, b): return a**2 - b**2print(square_sum(3, 4

This article mainly Introduces Multi-threaded Python Programming (7): Using Condition for complex synchronization, this article uses the famous "producer-consumer" model to demonstrate how to use Condition in Python to implement complex synchronization, if you need it, please refer to the fact that we have used Lock to

This article mainly introduces the example of using the original socket for network programming in Python. using sock_raw to accept and send packets can avoid many restrictions on the network protocol, you can refer to the experiment where you need to construct a separate HTTP data packet, and use SOCK_STREAM to send d

Introduction For Python, there is no shortage of concurrency options, and the standard library includes support for threads, processes, and asynchronous I/O. In many cases, Python simplifies the use of various concurrent methods by creating high-level modules such as asynchrony, threads, and child processes. In addition to the standard libraries, there are third

socket_server.py #!/usr/bin/env python# 导入socket模块import socket# 配置host和porthost = ‘192.168.128.128‘port = 1234# 新建一个socket连接s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)# 设置socket参数s.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)# 绑定IP和端口s.bind((host,port))# 监听s.listen(5)# 用while循环一直接受连接,如果不配置while循环，程序执行一次就退出了while 1: # 接受连接，并把客户端的连接信息赋值给clientsock,和clientaddr clientsock,clientaddr = s.accept() # 打印客