Python

Recently learning Python, I think this language is relatively easy to get started, but some of the foundation is to rely on a bit of accumulation, so want to write some blog record My Learning path.The first thing you need to know about this module

1. Bubble method (Direct exchange Element)1 defBubble_sort (a_list):2A_len = Len (a_list)-13 whileA_len >0:4 forIinchRange (A_len):5 ifA_list[i] >a_list[i+1]:6A_LIST[I],A_LIST[I+1] = a_list[i+1],a_list[i]7 8A_len-=19 Ten if

1 fromNumPyImport*2 Importmatplotlib3 fromOsImportListdir4 ImportKNN5 defimg2vector (filename):6Returnvect = Zeros ((1,1024))7FR =open (filename)8 forIinchRange (32):9Linestr =Fr.readline ()Ten forJinchRange (32):

Transfer from Http://www.iplaypython.com/jinjie/jj114.htmlreverse () methodReverses the order of the elements in the list, such as the following>>> x = [1,5,2,3,4]>>> X.reverse ()>>> x[4, 3, 2, 5, 1]Reverse list reversal sort : The order of the

#-*-Coding:utf-8-*-Set set unordered non-repeating sequenceSE = {"A", "B", "C"} #创建SET集合Print (Type (SE))Li = [1,2,2,3,4] #转换一个列表成SET CollectionSE1 = Set (LI) print (SE1)SE2 = set ()Se2.add (123); Se2.add (567); Print

Http://norvig.com/spell-correct.htmlThe basic principle is probability statistics, the highlight is Python's various characteristics of the author's use of the superb, especially to get word with a distance of 2 to edit all the words, first find

Today I learned the Python decorator, feeling this thing is still a little bit more complex, so record down, convenient for later search. Although the title is Python 3.x decorator, but I have not how to use Python 2.x, it should be similar to

1.>>> d = {‘x‘: ‘A‘, ‘y‘: ‘B‘, ‘z‘: ‘C‘ }>>> for k, v in d.iteritems():... print k, ‘=‘, v... y = Bx = Az = C2.>>> L = [‘Hello‘, ‘World‘, ‘IBM‘, ‘Apple‘]>>> [s.lower() for s in L][‘hello‘, ‘world‘, ‘ibm‘, ‘apple‘]3.def add(x, y, f): return f(x) +

Pandas provides three main ways to merge data: Pandas.merge () method: merging of database styles; Pandas.concat () method: An axial connection that stacks multiple objects together along an axis; instance Method Combine_first ()

ObjectivePython's actions for files and folders.involves traversing all files under a folder, reading and writing files, and so on.Code OneFunction: Find the name of all the files under the folder (including subfolders), find the file containing

The median is a numeric value that divides a set of values into two upper and lower parts that are equal. If the number of data in the list is odd, the middle of the list is the median of the list data, and if the number of list data is even, the

Problem:There are two special cases in the function definition of Python, that is, the form of *,** appears.such as: Def myfun1 (username, *keys) or Def myfun2 (username, **keys) and so on.Explain:* Used to pass any of the parameterless parameters,

Previously, using Urllib and Urllib2, just to get the HTML content of the specified URL, and to parse and filter the content, would need to be done with a regular expression in Python .First, the preparation of knowledge:1. A brief description of

Id_db={1: "WH", 2: "WX", 3:{1: "A", 2: "B", 3: "C"}, 4:["A", "B", "C"]}Print (id_db) #数据字典Print (id_db[2]) #取值id_db[3][1]= "AAAA" #改值 print (id_db)id_db[3][4]= "D" #增加元素 print (id_db)Del (id_db[3][4]) #删除指定元素 print (id_db)Id_db2={1: "Whhhhhh", 5: "55

#!/usr/bin/env python#coding:utf-8from flask import flask,request,render_template,redirect #request   contains all the contents of a network request, all URL parameters (get parameters), all in Request.args, args is a dictionary-like data

ObjectiveAlways want to write something in front, to record the process of learning, I have to admit that Python does not learn, but, not to learn, I am convinced of this truth. So I'll stick to it.Specific content last review:1, list operation can

Python learning notes-functions and python learning notes 1. Define the function: In Python, define a function to usedefStatement, write the function name, parameters in parentheses, and colons in sequence:Then, write the function body in the indent

Python learning notes-several data types, python learning notes 1. list: 　　A built-in data type in Python is list: list, which is represented by brackets. List is an ordered set. You can add and delete elements at any time, and the element types do

Python interview questions -- Obtain the median of the list and the median of python Median is a value that divides a set of values into equal upper and lower parts. If the number of data in the list is an odd number, the data in the middle of the

Selenium positioning element, selenium Positioning Commands (command) ActionPerform operations on the current statusIf the test fails, stop the test. AssertionCheck whether a correct value is generated Element LocatorsSpecify an element in HTML