Python

Python supports format from 2.6, a new, easier-to-read string formatting method that changes from the original% mode to a new, more readable The curly braces declare {}, the parameter reference declaration before the render, and the curly

Automatically submit Baidu via Python crawl URL URLsYesterday, colleagues said, you can manually submit Baidu such index will go up.And then I thought about it. Should I get a py and then submit it automatically? Thought of it. Or get one of

Install the request Library1, run inside input CMD Direct input PIP install requests Enter, you can install2, enter Python directly in the terminal to enter Python's own idle3, the following command to crawl Baidu page information

Nametupleis a tuple extension subclass, named tuples, essentially simple class objectsFrom collections Import Namedtupleinfo = Namedtuple ("Info", [' Name ', ' age ', ' height ']) # Assignment, is not a bit like object-oriented instance variable

First, the Python garbage collection mechanismGarbage collection in Python is based on reference counts and is supplemented by generational collections.In Python, if an object has a reference count of 0,python, the memory of the object is reclaimed

Lambdaanonymous function, the core is as an operator, processing logic only one row but with functions of the characteristics, the core for functional programmingTernary operatorsEssentially a simplified version of the if branch that satisfies the

1. How to remove axes:Plt.axis (' off ')2. How to remove the scale:Plt. Xticks ([]) Plt. Yticks ([]) The above statement needs to be placed before Plt.show (), Plt.imshow () after [1][1] 52931883Example:# Remove the horizontal ordinate value x1 = np.

Python parsing Web Access logs Common Log Format127.0.0.1--[14/may/2017:12:45:29 +0800] "get/index.html http/1.1" 200 4286Remote-host IP Request time TimeZone Method Resource Protocol status code send bytes Combined log Format127.0.0.1--[14/

1. First Order traversal: the right subtree, left dial hand tree, root node1 # Sequential Print binary tree (recursive) 2 def preordertraverse (node): 3 if is None: 4 return None 5 Print (Node.val) 6 preordertraverse (node.left)7

Student = [{"No": 1,"score": 90},{"No": 2,"score": 90},{"No": 3,"score": 88},{"No": 4,"score": 92}]#single-level sorting, sorted by score onlystudent_sort_1= sorted (student, key=LambdaE:e.__getitem__('score'))#multilevel sorting, first according to

1 Subclass Call Parent Class construction methodclassAnimal (object):def __init__(self):Print("Init Animal class~") defRun (self):Print("Animal run!")classDog (Animal):def __init__(self):#The Kawai class does not override the constructor method,

OverviewModule BriefPython__name__Module Benefits Improved maintainability of the code Improved code consumption, when a module is complete, can be referenced in multiple places Conflicts between function names and variable names

First, the data typeThe most common data types are: integer (int), float (float), string (STRs). For example: #整型 a=8 #浮点型 b=8.0 #字符串 c= ' Hello World '.Conversion of data types: variables of different data types cannot be compared or calculated,

1. What is lambda?Func=lambda X:x+1print (func (1)) #2print (func (2)) #3 # above Lambda equals the following function def func (x): return (x+1)It can be thought that lambda, as an expression, defines an anonymous function, where code x is the

Deploying Django on productionThere are many ways in which Django can be deployed, and the way to adopt NGINX+UWSGI is one of the more common ones.Uwsgi IntroductionUWSGI is a Web server that implements protocols such as WSGI Protocol, UWSGI, HTTP,

1. What is the difference between post and get?1. According to the HTTP specification, get is generally used to obtain/query resource information, which should be secure and idempotent. And post is typically used to update resource information 2.

This is a personal learning run code, the results are not posted, there is a need to run their own, for reference only, there is no known can communicate privately, there are problems can also contact me. Of course, I can only provide a little

#!/usr/bin/env python# Encoding:utf-8# DATE:2018/5/25Import res =' 124311200111155214 'SS = Re.search (‘(? P\d{3}) (? P\d{3}) (? P\d{4}) ', s). Groups ()Print (ss)# (' 124 ', ' 311 ', ' 2001 ')SS1 = Re.search (‘(? P\d{3}) (? P\d{3}) (? P\d{4}) ',

From selenium import WebdriverFrom Pathlib import PathFrom time import sleepDriver = Webdriver. Chrome ()Driver.get ("http://www.baidu.com")driver.find_element_by_id (' kw '). Send_keys (' Selenium ')driver.find_element_by_id (' su '). Click ()Sleep

#!/usr/bin/env python-coding:utf-8-Import timeFrom datetime import datetimeImport CalendarImport MySQLdbImport SysClass Getdaymonth (object): def getlastdayoflastmonth (self,step): D = DateTime.Now () year = d.year month = D.month if month = =