Python

#encoding =utf-8Import requestsImport JSONClass HttpClient (object):def __init__ (self):Passdef __post (Self,url,data=none,json=none,**kargs):Response=requests.post (Url=url,data=data,json=json)return responsedef __get (Self,url,params=none,**kargs):

1 CSS3 Selector 1.1 Basic SelectortagName.className#idName*slector,selector,selector1.2 Level Selectorselector1 selector2 后代selectoer1>selectoer2 子元素selector1+selector2 紧邻在后面的兄弟元素selector1~selector后面所有兄弟元素1.3 Property Selectorselector[attr]

1: List of lists definition:A sequential, orderly sequence of numbers consisting of elements that can be any object (number, String, object, list), an element can be used for index lookups, and a linear data structure. Use [] to denote. The list is

Environment: Centos7 python3.6Test URL: www.bai.comTest method: Crawl Baidu 100 timesResults:aio:10.702147483825684sRequests:12.404678583145142sThe speed of the asynchronous framework is still significantly improved.The following contribution

ReadLinesJust like read without parameters, ReadLines can read the entire file in a row and return a list with the data of each row being an element # coding=utf-8 f = open ( " Test.txt ", " R " ) content = F.readlines () print (type (

Encountered a topic in leetcode operations involving the deletion of elements of an array: Remove and DelThe main idea is to delete duplicate data from an arrayThe code submitted is as follows (Python3):"Created on 5, 2018@author:m24" from math

Functions can be broken down into built-in functions and custom functions. The main focus of this time is the custom function. Once the function is defined, it can be called wherever it is needed.1 Importance of the return value3 cases of Return

Installation:pip install virtualenvUse to create a virtual environment:cd project_dirvirtualenv venv When you create a virtual environment, you copy all the libraries in the current PIP environment to the newly created virtual environmentActivating

When a request arrives, first determine if the request header content_type is not [application/x-www-form-urlencoded]-If so, assign the request data to Request.body and then parse the data into a dictionary to assign the value to Request.postSo we

Format: \033[display mode, font color, background color m ... [\033[0m]-------------------------------------------Font Color| Background Color |Color Description-------------------------------------------30 | 40 |Black31 | 41 |Red32 | 42 |Green33 | 4

import smtplibfrom email.mime.text import mimetextfrom email.mime.multipart  Import mimemultipartfrom email.mime.image import mimeimagedef get_content (Text,type):     ret = mimetext (Text,type)     return retdef get _img (Imgfile,imgid):

Str.join () splicing with XXList and dictionary re-circulation when the deletion will be omittedCopy a new dictionary or a new list to delete with the new dictionary or the values in the new column tableThe. Fromkeys () returns to the new dictionary

Python provides two very important features to handle the exceptions and errors that Python programs run in. You can use this feature to debug a python program.Let's see what the exceptions are:Python Standard exception Exception name

The interface returns data:Print sql[0][10]{"Recv_name": "rdgztest_63126", "Send_name": "rdgztest_63126", "Recv_avatar": "https://wx.qlogo.cn/mmopen/vi_32/ q0j4twgtftj2bwib0tf1ppufhlbn2w1tcoy68o0mjgkorske6ubibhtnsi3a8dseww6icj5vu0oln8wpwefhrde1w/132

DictionaryUse {} to representKeys must be hash-Key-value pair data {Key:value}Key must be unique.IncreaseDic[key] = valueDic.setdefault (Key,value) does not exist, operates onDeletePop (key) can return the deleted valueDel Dic[key]Popitem () Random

This factory model is used less,It may be used more in the programming of the game class.This is a clear line of thought and must be OK.classFrog:def __init__(self, name): Self.name=namedef __str__(self):returnSelf.namedefInteract_with (self,

Scene:When Java plus decryption and Python encryption and decryption, because some non-display characters can not confirm whether the two are consistent, it is necessary to play their hexadecimal byte array to compare1.python Code ImplementationStr=

Write a function to determine whether a number is a "happy number".A "Happy number" is defined as: For a positive integer,Each time you replace the number with the sum of the squares of the numbers at each position, and then repeat the process until

One. Python basic data type1. int ==> integer. Used primarily for mathematical operations2. str ==> string, can save a small amount of data and do the corresponding operation3. Bool==> judgment True, false4. list==> stores large amounts of data. Use

# Slices#Slice gets part of data in object [start position: End position (not included): Step]Qpstr ="Shandong Jacky"result= Qpstr[1:3: 1]#Dong ZhangPrint(Result)#Quick Pick up top tworesult = Qpstr[:2]Print(Result)#quickly take the latter tworesult