python exit program gracefully

This article mainly introduces how to implement a simple socket program in python to transmit messages between two computers. it involves Python socket operations and has some reference value, for more information about how to transmit messages between two computers, see the example in this article. Share it with you for your reference. The specific analysis is a

This article describes how to add a graphical interface for a Python program. graphical interface programming is essential for developing a Python local application. For more information, see third-party libraries that support multiple graphical interfaces in Python, including: Tk WxWidgets Qt GTK And so on.

Program: Shopping Cart ProgramDemand: After you start the program, let the user enter the payroll, and then print the list of items Allow users to purchase items based on their product number After the user selects the product, checks whether the balance is enough, enough on the direct debit, enough to remind You can exit at any time to print

#!/usr/bin/env python#_ *_ Coding:utf-8 _*_#Author: Liujindong#datetime: 2018/6/11 16:34‘‘‘This program is a shopping cart program, including user portal, merchant entrance.User Portal: Purchased goods, Balance records.Merchant Entrance: You can add goods, modify the price of the goods.‘‘‘Import Time,sysdef business_entrance (productlist):F1=open (productlist, '

Money"Print "2.shopping"Print "3.take Money"Print "4.add Money"Print "5.check Bill"Print "6.exit"Chose=raw_input ("Choose:")If chose = = "1":f= open ('/python/atmuser.txt ')C=f.readlines ()For line in C:Print LineIf chose = = "2":Chooping = []Shmoney = []Fi=file (' Shopping.txt ')For lines in Fi.readlines ():p = lines.split () [0]m = Lines.split () [1]Chooping.append (P)Shmoney.append (M)Print Chooping,shm

This article mainly introduces the use of PDB modules to debug Python program instances, this article focuses on the Pdb.run () function, Pdb.runeval () function, Pdb.runcall () function, Pdb.set_trace () The use of functions and the PDB debugging commands and so on content, the need for friends can refer to the following In Python, syntax errors can be found by

Python uses the SocketServer module to compile the basic server program tutorial, pythonsocketserver SocketServer simplifies the compilation of network servers. It has four classes: TCPServer, UDPServer, UnixStreamServer, and unixw.ramserver. These four classes are processed synchronously. In addition, the ForkingMixIn and ThreadingMixIn classes support Asynchronization. Create a server. First, you must cre

payElsePrint ("Your balance is:", salary, ", Can't Buy:", list[choice][' name '])ElsePrint ("The item you entered does not exist, please re-enter ...")Continue# If you enter a value of w/w, go to checkout cartelif Choice = = ' W ' or choice = = ' W ':If Shoppcar:Print ("The item you have purchased:")Print ("---------------")For I in Shoppcar:Print (I[0])Print ("---------------")Print (">>> you now have a total surplus:", salary)BreakElsePrint (' * * * pro! You have not purchased a product to

Write a python service monitoring program Preface: Install Python2.7 in Redhat Rhel6.4 comes with 2.6, and some machines are found to be python2.4. Download the source code from the python website, decompress it to Redhat, and then run the following command: #./Configure -- prefix =/usr/local/python27 # Make # Make install After installation, Python2.7 is not ena

Tutorial on implementing a distributed process in a Python Program This article mainly introduces how to implement distributed processes in Python programs. It is very useful in multi-process programming. The sample code is based on Python2.x. For more information, see Process should be preferred in Thread and Process because Process is more stable and can be dis

First Program Open Pycharm, create a new project, create a new file (suffix. py) Write the simplest code:print(人生苦短，我用python!) Execute Python code Using the Pycharm Run button Terminal input: Python file name Switch working directory:cd 目录 There are two ways to

Requirements 1, after starting the program, enter the user name password, if it is the first time to log in, let the user enter wages, and then print the product list 2. Allow users to purchase goods according to the product number 3, the user selects the goods, checks whether the balance is enough, enough on the direct debit, not enough on the reminder 4, can withdraw at any time, exit, print purchased go

This article mainly introduces the example of a network program that implements ftp-like file transfer in python. if you need this code, you can refer to it and write it on linux. it is applicable to linux and windows, and several commands need to be changed. 1. enter the IP address and port of the client to connect to the server. the user name and password are required for verification. 2. use an independe

. The real return result is cursor.fechone (), which represents the first rule to get execution results. There is also Cursor.fetchall (), which indicates that all results are obtained. If more than one field is obtained, the result is an array type sorted by the field order of the query results. MySQLdb is a module that Python connects to the database. This module does not exist and needs to be downloaded and installed into the

This article mainly introduces the restart and Shutdown program implemented by python, which has good reference value. If you need it, you can refer to the following example to describe how to restart and shut down the program implemented by Python, it has some reference value for