python pubsub example

Example of reading and writing files and storage in Python Programming, 1. File writing and reading #! /Usr/bin/python #-*-coding: UTF-8-*-# Filename: using_file.py # The file is created and read by s = '''. We are both wood leaders, you are not allowed to speak! ''' # Create a file and write the character f = file('test_file.txt ', 'w') f. write (s) f. close ()

This article introduces the comparison operation in Python, which can be used to compare the size of two numeric data and the size of a string or list. The comparison of numeric data is very simple, and if the expression is true, return True and False for false, consider the following example: >>> 1>2False>>> 1True#比较两个数值数据是否相等的时候, you need to use the double equals sign>>> 1==1True>>> 2>=1True>>> 2>=2True

Take a look at the code first: # ~*~ Twisted-a Python tale ~*~ from time import sleep # Hello, I ' m A developer and I mainly setup wordpress.def install _wordpress (Customer): # Our hosting company Threads Ltd. is bad. I start Installation and ... Print "Start installation for", Customer # ... then wait till the installation finishes successfully. It is # boring and I ' m spending the most of my time waiting while consuming # resources (memory

Use the example to explain how to optimize the database query by using the prefetch_related () function in the Django framework in Python, pythondjango Instance background Assume that the Personal Information System must record the home, residence, and city of each individual in the system. The database design is as follows: The content of Models. py is as follows: from django.db import models class Provin

The reduce () function accumulates elements in the parameter sequence, and the following article mainly introduces the use of the reduce () function in Python, which is described in detail by the example code, which has a certain reference value for the study or work of everyone. The friends who need to take a look below. Objective This article mainly introduces to you about the use of the reduce () functi

This article describes the usage of slicing operations in Python in the form of examples, and shares them for reference, as follows: Taking a list or tuple element is a very common operation. For example, a list is as follows: >>> L = [' Michael ', ' Sarah ', ' Tracy ', ' Bob ', ' Jack '] What should I do if I take the first 3 elements? The more stupid way is as follows: >>> [l[0], l[1], l[2]][' Michael

The use of Python functions is described in detail in this paper, and it is of great value for beginners to learn Python's friends. Share it for everyone's reference. The specific analysis is as follows: In general, the function of Python is written by a new statement that DEF,DEF is an executable statement--the function does not exist until Python has run def.

This example describes the Python callback function usage. Share to everyone for your reference. The specific analysis is as follows: There is always a certain interface between software modules, which can be divided into three categories: synchronous invocation, callback and asynchronous invocation. A synchronous call is a blocking call that is returned when the caller waits for the execution to complete

Python-colored Linux Command Line terminal interface code example sharing, pythonlinux First look at the effect: In linux terminals, ANSI escape sequences are used to control colors.Basic rule: Add \ 033 [to the front and end with \ 033 [0 m to the original colorEnter the following sentence in the terminal to see the green hello output. >>echo -e '\033[0;32mhello\033[0m' 0; 32 m control color.The simplest

Python implementation iterator (iterator) method example, pythoniterator Overview An iterator is a way to access collection elements. The iterator object is accessed from the first element of the set until all elements are accessed. The iterator can only move forward without moving back. Lazy evaluation) The iterator does not require you to prepare all elements in the entire iteration process in advance. Th

1---2 * * 32 3---True andTrue4TrueorFalse5 notTrue6 7---python isa Smart language85/2 = = 5.0/2.0//False95 * 2 = = 5.0 * 2.0//TrueTen One---python isstore values instead of expression A ----Str ->>> 3 *'a' the 'AAA' - ->>> 3 *'AB' - Ababab + ->>>'a'+'a' + AA A at>>>'a'+ STR (3) - A3 - - function -1. Len () -2. Extract in2.1'ABC'[0] >>>'a' - 'ABC'[-1] >>>'C' to2.2'string'[Beg:end] [beg

This article mainly introduces the usage of Python inter-process communication, and involves the skills related to Python operating processes through the multiprocessing module. If you need it, refer to the following example to describe the usage of Python inter-process communication. Share it with you for your referen

knowledge, string segmentation and so on. Here for the convenience of data processing, in the acquisition of storage time to follow a certain format to store, views of the method is easy to do processing.The front-end code is as follows:Test report?At lastIt is easy to write a tool in Python, and it is important to make it easier to meet the needs of your actual work. If you want to do a complete interface test, try to use a proven tool. Long p

directly use this command.Copy codeThe Code is as follows:# Create an account name and password for a file nameHtpasswd-bc. htpasswd admin 123456When a directory contains a. htpasswd file, the mini_httpd dialog box asking for the user name and password is displayed. You can view the file only after entering the correct information. If the file does not exist, you can view the file normally. Because my cgi application is based on Python, I hope

Since C ++-related materials are frequently queried, it is too difficult to read books, msdn is too large, and it is too slow to query on the Internet. Therefore, we decided to package www.cplusplus.com into CHM for query purposes. After the website is down, it is found that there are still a lot of work to be done to make it into a CHM. For example, you should remove the login in the upper right corner of the page...I just learned

This example describes the Base64 encryption and decryption method in Python. Share to everyone for your reference. The specific analysis is as follows: First, base64 Base64 is a representation that represents binary data based on 64 printable characters. Because 2 of the 6 times equals 64, each 6 bit is a unit, corresponding to a printable character. Three bytes have 24 bits, corresponding to 4 Base64 un

code above is equivalent to The code is as follows Copy Code @entranceDef fun1 ():Pass@entranceDef fun2 ():Pass What is the use of the adorner? From this deliberately constructed very simple example, you can see the meaning of the adorner, if a function requires a function, if the function can be used on many functions, or the function is not the implementation of their own, then you can write an adorner to i

Objective Every operational officer should be aware of the configuration of the machine he is managing, because it is very helpful for us to deal with the problem quickly, for example, as the business grows, suddenly some machines load up badly, at this time to troubleshoot reasons, in addition to from the application, architecture analysis, the current hardware performance analysis should be an essential link, Today we will not use the third party m

Programming is not a simple code, writing process also need to consider the efficiency of execution, if a piece of code of high computational complexity, data volume of a large difficult to get reasonable results in a limited time, so need to write code, as far as possible to consider the complexity of the calculation, reduce invalid loops, more simple operation instructions, Reduce logical judgment, reduce nesting, and then consider the readability of the code to facilitate teamwork.In A recent

This paper describes the definition and usage of the zip () function in Python, which is believed to be useful for beginners of python. Details are as follows: First, the definition: Zip ([iterable, ...])Zip () is an intrinsic function of Python that takes a series of iterated objects as parameters, packages the corresponding elements in the object into tuple (t