Python

Speaking of Python coding, it is a very sad sentence. Counted, repeated two months of tossing and counting. Fortunately, finally combed clear. As a communist, be sure to share it with everyone. If you're still having headaches because of coding,

URL https://movie.douban.com/top250A total of 250 films, with pagination, to get detailed information for each partDo not use frames, read Web pages with Urilib, re perform regular expression matching, lxml XPath lookups1 fromFilmImport*2

GeneratorGenerator function: The function body contains the yield keyword, the result of which the function executes is the generator, which is essentially an iterator.deffoo ():Print('First ------>') yield1Print('Second----->')

Python multi-process and multi-threaded who faster python3.6 Threading and multiprocessing Quad core + Samsung 250G-850-SSD Since programming with multi-process and multi-threading, it is not clear who is faster. Many

This character encoding problem is often encountered in python, especially when working with Web page source code (especially in crawlers):Unicodedecodeerror: ' XXX ' codec can ' t decode bytes in position 12-15:illegal multibyte ...The following is

EnterPythonInteractive mode, press the Delete/backspace key, the ^H character will appear workaround: 1. Modules directory into  Python  [[email protected] python-2.7.12]# pwd / root/python-2.7.12 [[email protected] python-2.7.12]# cd

Common operations for strings include, but are not limited to, the following operations:字符串的替换、删除、截取、复制、连接、比较、查找、分割等This will summarize the built-in operation methods of the string, with emphasis on showing it in the form of examples.使用type获取创建对象的类

First, counter (counter)The counter (counter) returns the number of occurrences of each character in a sequence as a dictionary, a value of key, and a number of values#!/usr/bin/env python#-*-coding:utf-8-*-#导入collections模块import

First, the creation of a stringTest = str ()/"" "Test = str (" Licheng ")/" Licheng " No arguments, creating an empty string A parameter that creates a normal string two parameters, int (bytes, encoded) Second, the common

Tag: Hello requires element ROM example structure format TTL nbspThe last article of the regular, in fact, for many people to use it is inconvenient, coupled with the need to remember a lot of rules, so use is not particularly skilled, and this

SOURCE program:Import"www.baidu.com"# 127.0.0.1target_port =# Build a Socket object # Create a TCP connection # Connection Client client.connect (Target_host, Target_port))Client.send ("get/http/1.1\r\nhost:baidu.com\r\n\r\n")Error background:

The examples in this article describe how Python handles XML-formatted data. Share to everyone for your reference, as follows: Here the operation is based on the Python3 platform. The first thing you'll encounter when using Python to handle XML is

I. Variable naming rules 1. Variable names can only be letters, numbers, Any combination of underscores 2. Variable names cannot begin with a number 3. Some reserved fields cannot be used as custom variable names 4 variable names need to have a

Python crawler audio data and python crawler audioI. Preface This crawler crawls the information of each channel of all radio stations and the information of each audio data in the channel under the popular Himalayan topic, and then saves the

Python crawler path of a salted fish (5): scrapy crawler framework, pythonscrapy Introduction to scrapy crawler framework Installation Method pip install scrapy. I use the anaconda command to install scrapy for conda.       1. The Engine obtains a

Python Note 5: decorator, built-in functions, json, and pythonjsonDecorator The decorator is essentially a Python function that allows other functions to add additional functions without any code changes. The return value of the decorator is also a

Python code Basic Auth simple example, pythonauth This blog post mainly describes how to encode the user name and password into strings in the Python3 environment. The Code is as follows: Import base64def get_basic_auth_str (username, password):

Python implements decision tree C4.5 algorithm (improved based on ID3), c4.5id3 I. Introduction C4.5 is mainly improved based on ID3. ID3 selects the node with the largest information benefit value as the node. C4.5 introduces the new concept

Python implements the website registration verification code generation class, and python website registration This example shares the code of the Python website registration verification code generation class for your reference. The details are as

PYTHON blog record 0602, python blog 0602The following content is from the unicodestring in MOOC http://www.imooc.com/learn/177 python. There is another encoding problem in the string.   Because the computer can only process numbers, if you want to