Python

Douban# coding:utf-8from urllib.request Import urlopenfrom bs4 Import beautifulsouphtml = Urlopen ("https://movie.douban.com/" Bsobj = BeautifulSoup (HTML, "lxml") # converts an HTML object to a BeautifulSoup object lilist = Bsobj.findall ("Li",

I. Meta-group 1, concept list: is an ordered set of The difference between a tuple and a list: ? A. List: [] tuples: () ? B. Elements in a list can be added and deleted, but elements in a tuple cannot be modified ? C. The same

Three ways to introduce static files:One:LinkRel="Stylesheet"href="/static/dd/ssmycss.css" >Two:{%Load static%}Linkrel="stylesheet" href="{% static ' dd/ss/mycss.css '%}" >{# return value:/static/dd/ ss/mycss.css#} III:link rel="stylesheet" href="{%

Functional Requirements:Example 1:Input: 121Output: TrueExample 2:Input:-121Output: falseExplanation: Read from left to right, 121. Read from right to left, 121-. So it's not a palindrome number.Example 3:Input: 10Output: falseExplanation: Read from

Functional Requirements:> Given a sentence (containing only letters and spaces), reverses the position of the word in the sentence, divides the word with a space, has only one space between the words, and no space before >.For example: (1) "Hello

A list can use all the standard actions that apply to a sequence, such as indexes, shards, joins, and multiplication. But the list also has its own operations, such as modifying the actions of the list itself, including element assignment, element

# higher-order functions# mathematical Concept y = g (f (x))# Higher order functions must satisfy at least one condition# 1 takes one or more functions as arguments (e.g.: f (x))# 2 Returns a function objectdef counter (base):def inner (step = 1): #

Perhaps in the learning of reptiles, encountered a lot of anti-crawling means, IP is one of them.For IP-sealed sites. Need a lot of proxy IP, to buy proxy IP, for beginners feel no need, each sell proxy IP site has provided free IP, but very few,

I. Yesterday's content review1. int +-*/%//* *Bit_length ()2. BOOL type ConversionConclusion 1: Want to convert Liu Wei into Andy Lau. Andy Lau (Liu Wei)Conclusion 2:true = 1 False = 0Conclusion 3: Data that can be treated as false: 0, "", [], (), {}

ObjectiveLook first:Ideas1. Confirm the URL of the visit2. Demo Login your QQ number3. Determine if the friend space is added permissions, switch to the said frame, crawl the current page data, pull down the scroll bar, page to continue to get

One: Gil Global interpreter Lock IntroductionInCPython, the Global interpreter lock(OrGIL)python byte code. This lock is required, cpython memory management is not thread-safe. ( However, due to gil Other features have become dependent on the

InheritedThe way that inheritance behaves:class Animal (): Pass class Cat (Animal): #Animal is the cat's parent class, or it can be said to be the base class passprint(cat. __bases__)# View all the cat's parent classesSingle inheritanceA

is because the Django settings automatically load the configuration file. You can add--noreload after running the command so that only one process is displayed, but after modifying the file, Django does not actively load the configuration file.if

Python comes with a unit test framework, UnitTest module, which is used to do unit testing, which encapsulates some of the methods of verifying the return results and some initialization operations before the use cases are executed.Before you say

First, the file reading and writing modeThe python file is simple to read and write, just an open function.Open file methods are:Open (absolute path/' file name ', read-write mode, encoding= ' Utf-8 '), opening this way file, after operation, to

Python OS module important points of knowledgeThis is very important, mainly about the file path, I have stepped on a lot of pits, today summed up, convenient to avoid the path associated with the various pits!1, first we want to get all the folders

2 pieces of articles are referenced:View python location which pythonFirst back up 1, sudo cp/usr/bin/python/usr/bin/python_cp Delete 2, sudo rm/usr/bin/python //The default setting is python3.5,Create a link (I'm just going to find the parser path

1. Print less than 10 even: bit operationfor i in range(10): if not i & 0x01: print(i)2. Given a positive integer that does not exceed 5 bits, it is judged by several (using the input function)Method One: normal logical

Two days before the small series in the understanding of the above to see a post published in 2014, the author said he was in 2012 when writing automated trading program with Python, earning 200W.Small series also hold a more skeptical attitude to

This article brings you the content is about how Python to achieve client and server-side data transmission, there is a certain reference value, the need for friends can refer to, I hope to help you. Client Def sock_client_data (): while True: