Python

Go to Blog: Shanghai-leisurelyObjectiveElement positioning can be said to be the learning automation of the small partner encountered a threshold, learned to locate also opened the two veins, before sharing selenium 18-like martial arts, plus five

ObjectiveTo unittest here can basically build a simple project framework, we can use a run_main.py script to control the execution of all the use cases, and generate reports, send messages a series of actionsFirst, the new project1. Open the

ObjectiveIn the design of use cases, some use cases are only parameter data input is not the same, such as login this function, operation process but the same. If the use cases repeat the write operation process will increase the amount of code,

List, tupleCheckIndex (subscript), all starting from 0Slice. Count checks the number of occurrences of an element. Index to find its corresponding location according to the content"Haidilao ge" in aIncreaseA.append () AppendA.insert (Index, "content"

names=["Alex", "Peter", "Sam"Add: Names.append ("Tom"), inserted at the end of the position;Names.insert (2, "Tonny"), specifying position insertionNames.extend (list) extension listDelete: Names.remove ("Alex")Del Names[2]Names.pop (0) default last

Pip Install Virtualenv Download module using domestic image: Pip Install-i Https://pypi.douban.com/simple/django New virtual Environment: Virtualenv scrapytest CD Scrapytest CD Scrapytest Run: Activate.bat Exit: Deactivae.bat

Base Library1. Regular Expressions: ReSymbol() parentheses--grouping[] Brackets--The character class, matches any one of the characters #注: Character Set "" in the content as ordinary characters! (except-\^){} curly braces--qualifying number of

Linux can be sorted using sort, Python is the same, how to implement a list of a number from small to large order, then write to the file, then read the file from the file content, and then the reverse order, and then append to the next line of the

1. Opening of the fileOpen the file by using the open () function. He has two parameters, file paths or filenames, and how files are opened."R" read-only mode, cannot edit and delete file contents."W" write mode, the contents before the file will be

http://ningning.today/2017/01/25/python/simple-python-metaclass/Https://stackoverflow.com/questions/25221072/how-to-write-a-python-abc-with-a-concrete-initializer-in-python-2-6-to-3-5Examples of specific operationsView Flask-restful Source views.py

ObjectiveSometimes it is not easy to find an element on the page by the attribute of the element, and you can crawl the information from the source. Selenium the Page_source method can get to the page source code.Selenium of the Page_source method

‘‘‘A tuple is defined in the same way as a list, but the entire set of elements is surrounded by parentheses, not square brackets.The elements of a Tuple are sorted in the order defined by the list.The tuples index is the same as list starting from 0

The DOM (Document Object model) object renders an HTML document as a tree structure (node tree) with elements, attributes, and text, and defines a standard way to access and manipulate HTML documents.First, find the label1, directly find the

Transferred from: https://www.cnblogs.com/arkenstone/p/6961453.htmlopencv3.2 the Chinese output to the pictureThe OpenCV Puttext function cannot output characters of type UTF8, so it is not possible to print Chinese to the picture. The freetype of

Go to Blog: Shanghai-leisurelyObjectiveIn the post request, sometimes the body part to pass the data parameter, and sometimes the body part of the JSON parameter, then the question is: When to pass the JSON, when should pass data?I. Identification

The If statement is used to determineIn Python programming, the IF statement is used for control program execution to detect a condition: if the condition is (true) True, the syntax block is run, and if Fales is skipped, it is not executed.elif is

Create a program that prompts the user to enter numeric values in a while loop and to build a list with more input values. When the user ends the input (press ENTER), the input value itself, the number of input values, the input value and the

The previous article says we want to collect http://www.gg4493.cn/data, and then:Step 2: For each link, get its web page content.It's simple, just open the Urls.txt file and read it one line at a time.It may seem superfluous here, but based on my

Requirements : Statistics of how many lines per minute, and 23:59 how many lines, 00:00 how many lines, file too large each file 2G, total 5 filesfiles : access_log.2017-11-06-00_00_00 file contents are as follows:21.123.42.233--[05/nov/2017:23:59:59

Python re module and Pythonre ModulePython re Module 1, compile (pattern): Create mode object ImportRe Pat = re. compile ('A') M = pat. search ('Ba') # Equivalent to re. search ('A', 'ba ') Print (m) #   import re pat = re.compile('a') m =