Python

Python implements a simple guess number game, as follows:Randomly generate a number between 1-10, let the user to guess, when guessed wrong, will be prompted to guess the number is big or small, until the user guessed right.Import Randomsecret =

Unicodedecodeerror occurs while running the Scrapy crawlerPaste the wrongThe reason is related to the registry, which may be related to the GBK format of some native software to the registry, resulting in Python's inability to install third-party

I have also written an article Python module: Configparser used to parse the INI file, but there are some problems in the use of the process. Like what:1, cannot be case sensitive.2, the re-write INI file cannot retain the comments of the original

The Python operator overload is to intercept the operation before the interpreter uses the object's built-in operation, using the overloaded method that it writes.Overloaded method: __init__ as constructor, __sub__ as subtraction expressionclass

One: Knowledge pointsThere are generally three modes of access to a file: Read mode ( ‘r‘ ), write mode (), ‘w‘ or Append mode ( ‘a‘ ). Two other modes that can be mixed: binary mode (' B '), read/write mode (' + '). such as: ' RB ': Read binary

Python's if Statement general formatif : elif: else: The condition of the IF statement can be expressed by > (greater than), = (greater than or equal), Some examplesExample 1:# -*- coding: UTF-8 -*-flag = Falsename =

Recently the boss presented a need, the project needs are roughly as follows: 1, using Raspberry Pi as a gateway, the bottom of a plurality of ZigBee sensor nodes, the gateway to the ZigBee sensor node collected information through the

1, the string--is immutableDefinition and initializationIn [577]: s = ' Hello wolrd ' in [578]: sout[578]: ' Hello wolrd ' in [579]: s = "Hello python" in [580]: sout[580]: ' Hello Pytho n ' in [581]: s = ' ' Hello ' ' in [582]: sout[582]: ' Hello '

1, List--is a sequence, for sequential storage of dataDefinition and initialization of a listIn [374]: LST = list () in [375]: lstout[375]: []in [376]: LST = []in [377]: LST = [1,2,3]in [378]: lstout[378]: [1, 2, 3]in [379]: LST = list (range (1,10))

123 #!usr/bin/pythonimportdatetimedatetime.datetime.now() This will return to microsecond. So this is what we don't need. So we have to make a change. 1 datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")

This week encountered some problems, and then realized that the basic knowledge for a period of time not consolidated, or there is a forgotten part, or need to review, here make a note, recordPrevious continuedA simple description of the subject,

Python's basic code is used here to implement the basic functions of the WC command program under the Linux system.#!/usr/bin/env python#encoding:utf-8# author:liwei# FUNCTION:WC program by Pythonfrom optparse import OptionParserimpor

Self-study for more than half a month python and WX, want to write a weather forecast to practice practiced hand, but write when encountered a lot of problems, very tangled, simply put things on the pass to you to see. Things are simple, just dozens

"" "In Python, there are two ways to use threads: a function or a class to wrap a thread object. 1. Function: Call the Start_new_thread () function in the thread module to generate a new thread. The end of the thread can wait for the thread to end

Association relation field (relationship fields) Foreignkey,manytomanyfield and Onetoonefield, respectively, define many to one, many to many, and the other in model. For example, a book is published by a publishing house, and a publishing house

Persistence means persisting objects, even between multiple executions of the same program. With this article, you have a general understanding of the various persistence mechanisms for Python objects, from relational databases to Python pickle and

Objective The Python data type is not allowed to change, which means that if you change the value of the Number data type, the memory space will be redistributed. The following words do not say much, to see the detailed introduction. The following

Abnormal The exception occurs when there are some abnormal conditions in your program. For example, when you want to read a file, and that file does not exist. Or when the program is running, you accidentally delete it. These conditions can be

Use only Python's random library to generate html-formatted label clouds for existing Data. The idea is to generate a view of the data for different sizes of different color words depending on how many times the same word Appears.For example,

How to add a proxy to your request in the Scrapy framework First, make preparations and create a Scrapy project. The directory structure is as follows: Note: The spiders directory contains three files, db. py, default. init, and items. json. Db. py