Python

List-derivedExample one: Any number within 30 that can be divisible by 3List derivation 1 for inch if is 0] Print (multiples) # Output: [0, 3, 6, 9, (+), (+) ,-Example two: The square of all numbers within 30 that can be divisible by 3List

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

There are many operators in Python, and today we're going to talk about what is the essential difference between the two operators of IS and = =.Before we tell the difference between the IS and = = operators, the first thing to know about the three

To use the class library:From BS4 import BeautifulSoupImport requestsPersonally prefer BeautifulSoupURL = "Http://www.jianshu.com/c/2ba824b6ed53?utm_medium=index-collections&utm_source=desktop"res = requests.get (URL)res.cencoding = ' Utf-8 'Soup =

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

This period of time to forget more bo, learn too much into the breath of Python have learned, do a few small projects to get started, amuse yourself, the notes are written in the Baidu Cloud notes, now began to paste all the notes are copied to

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

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

Dichotomy is a fast-finding method, with a low time complexity and simple logic, which is generally divided by 2 divided by 2 ...For example, to find the location of a keyword key in an ordered array of arr, first confirm the median or midpoint

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

1. Two objects in a view function1.1.request (Request object):Request. get {} GET Request dataRequest. Post {} POST request dataRequest. Post.getlist ()Request.method Request methodRequest.path Request PathRequest.get_full_path () Request full path 1

ObjectiveThe previous few are talking about how to locate an element, sometimes a page has multiple objects to operate, if one by one to locate, more cumbersome, this time you can locate a group of objects.Webdriver provides a way to locate a set of

Today to transform a IIS6 put upload vulnerability of a script, previously used http.client to complete, but personally feel some trouble, want to use a third-party library requests to achieve, but found that requests did not move method 650)

Dinosaur Games1 __author__="Cheney"2 3 4 ImportRandom5 Import Time6 7 defDisplayintro ():8 Print('you're on a continent full of dinosaurs.')9Time.sleep (2)Ten Print('in front of you, you will see two caves') OneTime.sleep (3) A Print('in

Tag:gcd   bin   .com    string    slist    type   port   main   tca    Import requestsimport Unittestimport Htmltestrunnerclass interface (unittest. TestCase): def setUp (self): Pass def test_case1 (self): url = ' http://www.baidu.com ' #百度 url1=ur

Python 3 iterator and generator, Python3 Generator Iterator Iteration is one of the most powerful functions of Python and a way to access collection elements .. An iterator object is an object that can remember the traversal position. The iterator

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 =

Python converts an image in a folder into a PDF file, Import OSImport stringFrom PIL import ImageFrom reportlab. lib. pagesizes import A4, landscapeFrom reportlab.pdf gen import canvasImport sys   Def file_name (file_dir, suffix = ". jpg "):L =

Python index, python Indexing principle: Ignore the tail Positive step from left to right Negative step from right to left A [0] =A [1] = BA [2] = cA [3] = dA [4] = eA [5] = fA [6] = g A = ['A', 'B', 'C', 'D', 'E', 'E', 'F', 'G']Print (a [6: 0:-

Shopping Cart python job, shopping cart python Functional requirements:The user is required to enter total assets, for example, 2000Displays the product list. You can select a product by serial number and add it to the shopping cart.If the total