Python

Position parameters:Like what:def Power (x, N): = 1 while n > 0: = n-1 = S * x return swhere x and n each occupy a position, so called positional parameters,The positional parameters must be passed in!Default parameters:Like

"Packaging" refers to the process of defining an already existing object as a system.Implementing authorization is a feature of packaging. Wrapping a type is typically a custom customization of a type that already exists, which can be created,

l=[1,2,3,9,4, ' 233 ', 5,6,7,9, ' 233 ', ' 233 ']L2=[' A ', ' number ', ' Enterprise 'L.append (45)L.insert (2,77)l[2]=66Print (L)L.remove (66)Del L[0]L.pop (2)Print (L)Print (L[2:4])Print (L[-4:-1])Print (L.index (45))Print (L[l.index (45)])Print

I. Using the reversed () functionA = [1, 2, 3, 4= List (Reversed (a))Note: the reversed () function returns an iterator instead of a list, which needs to be converted using the list function.Two. Using slicesA = [1, 2, 3, 4= a[::-1]Three. Using

The code in the main program contains a lot of things, if you do it in the program's. py file, you need to adjust the method again, but usually this call is deleted after the test is completed. So the problem is, if you send this code directly to

DescriptionIf you want to assemble a computer, the motherboard, CPU, memory and other components in accordance with a stable combination of steps, the basic process is unchanged, and the composition of the various parts of the computer can be

A dictionary is another mutable container model and can store any type of object. Each key value of the dictionary (Key=>value) is split with a colon (:), each pair is separated by a comma (,), and the entire dictionary is enclosed in curly braces ({

Tuples and lists are similar, except that tuples are two times the list is processed, the list is [], the tuple is (), and the tuple cannot be modified, added, deleted, and it is recommended to add a comma (,) after the tuple is written.Tuples

Insertion sort (Insert sort)By constructing an ordered sequence, for unsorted data, in the sorted sequence from backward to forward scan, find the corresponding position and insert;Because you do not need to compare all of them, sorting speed is

zip Returns an iterator that combines multiple, iterative objects into a single tuple sequence.1. Loop the data for multiple lists: 1 letters = [ " a , " b , " c " ] 2 nums = [1, 2, 3 ] 3 4 for letter, num in zip (Letters, nums): 5

DescriptionPrototype mode is concerned with the creation of a large number of identical objects or similar objects, with the intention of obtaining a new instance by copying an existing instance to avoid the overhead associated with creating such

Quick sorting (Quick sort)The basic idea of quick sorting: to separate the pending records into two separate parts by a sort of sequencing, where some of the recorded keywords are smaller than the others, then the two parts of the records can be

Merge sortMerge sort is an efficient sorting algorithm based on the merging operation. This algorithm is a very typical application of the partition method (Divide and Conquer). The ordered Subsequence is merged to obtain a fully ordered sequence, i.

This article mainly introduces Python using Add_subplot and subplot operation, involving Python using the Matplotlib module for graphic drawing of the relevant operation skills, the need for friends can refer to the following This example describes

This article mainly introduces the Django middleware implementation of the Interceptor method, has a certain reference value, now share to everyone, the need for friends can refer to 1. Preface Javaweb Struts2 Interceptors We are familiar with,

This article mainly introduces the python to write a simple Web server, has a certain reference value, now share to everyone, the need for friends can refer to Ide:pycharm sever.py #!/bin/python#-*-coding:utf-8-*-#文件名: server.py#create by Wzh 2017/

This article mainly introduces the coexistence of multiple applications of Django configuration method, has a certain reference value, now share to everyone, the need for friends can refer to 1. Configuring the Environment Install Python3 install

This article mainly for you to introduce the Python implementation of the supermarket scanning code meter billing, with a certain reference value, interested in small partners can refer to Python implementation of the supermarket scanning Code

This article mainly describes the Django project contains a number of applications when the URL configuration method, has a certain reference value, now share to everyone, the need for friends can refer to In most cases, there are multiple apps in

This article mainly introduces the method of direct return request from Django Middleware, has certain reference value, now share to everybody, need friend can refer to The examples are as follows: #coding =utf-8import jsonimport geventfrom