Python

You are ready to learn more about Python-related crawlers. Let's say that you can use Python to crawl a relatively regular page using "Urllib2 + beautifulsoup + canonical " to get it done. Then the dynamically generated information page. such as

Using Select Listener Terminal Operation instance to process multiple socket client requests concurrently with select: The server uses Select to implement pseudo processing of multiple socket client requests simultaneously: clientHere the socket

There is often a need to find a specific string in a text file, which is very well implemented and can be done almost anywhere with any text viewing tool. And sometimes, to find all the text files in a folder (a specific suffix), I have this problem:

Today's Overview:1. Built-in module2, the function of the co-process3. Recursion4. Process-oriented programming and function programming5. Module6. Package7. Re RegularOne, built-in module1. anonymous function lambdaDefinition: An anonymous function

Preface to Logger succession diagramIn the process of automated test practice, it is necessary to do log management, easy debugging and production problem tracking, Python provides logging module for log management. Below we will take a layer of

PackagingThe package is best understood. Encapsulation is one of the object-oriented features and is the main feature of object and class concepts.Encapsulation, which is the encapsulation of objective things into abstract classes, and classes can

The built-in function Zip function:  zip () is a python built-in function that takes a series of iterated objects as parameters, combining the corresponding elements in the object in order into a tuple, each of which contains the elements of the

Reference article: http://www.cnblogs.com/dmego/p/5965835.htmlIn a word: Learning procedure is not an end, understanding is good; Writing code is not necessarily, the best way to do it is to take it, check it, solve the problem! Information Age

Python arithmetic operatorsThe following assumes that the variable A is 10 and the variable B is 20: operator Description Example + Add-Two objects added A + B output result 30 -

If you do not have a calculator at work, you can use Python directly as a calculator. The following describes the operators in Python.+ Plus operator, if the ' + ' is numbered on both sides, the addition operation is performed. If both sides are

# # # Python's continuation walk function pitThe previous article briefly introduced some of the functions of the simple use, this time continue to trample the function of the pit1. Function objectsThe function can also be passed as a parameter to

exec objFunction: EXEC executes python statements stored in a string or file, and can execute more complex Python code than eval,exec. obj is the expression to execute.The exec return value is always None.Release Notes:* * It is necessary to

Using Python's string processing module, developers can write scripts to generate the same C, C + +, Java source programs, header files, and test files in the same format, avoiding a lot of repetitive work.This article outlines two methods for

DirectoryFirst, IntroductionIi. examplesThird, Form classIv. common selection of plug-insFive, custom validation rulesVi. Initializing data First, IntroductionDjango's form has the following major functionsGenerate HTML tagsValidating user

#Coding:utf-8" "#反射的基本用法: Hasattr Determines whether a method exists in the instance getattr specifies a method name, gets the memory address of the method, adds "()" parentheses and executes" "ImportSYSclassWebServer (object):def __init__(self,host,

# "Single underline"   The starting member variable is called a protection variable, meaning that only class objects and subclass objects can access these variables themselves; # "Double underline"   begins with a private member, meaning that only

# def Print_word (s): # return s# if __name__ = = ' __main__ ': # print_word (' helo ') # hello#---------------------------------- ---# but I want {s}#-------------------------------------def make_ul (FN): Print "@make_ul" Def warpped (): Return ' '

There are several ways to print information about the Linux command line date command in Python:Method 1: Directly call the Linux command output, also can print the host name;[email protected] tmp]# cat 1.py#!/usr/bin/pythonImport

This article mainly introduces the method of Python to convert Chinese numerals into Arabic numerals, involving Python string traversal, conversion related operation skills, the need for friends can refer to the following In this paper, the method

1. Constants and variables2. Basic Data type3. Operatorsfirst, constant and variable1. Constantsconstant : The amount whose value is constantOnce assigned, the value can no longer be changed;That means no more re-assignment, much like a read-only