Python

1. What is the basic syntax and function of the function?function is derived from mathematics, but the concept of "function" in programming is very different from the function in mathematics, the specific difference, we will say later, the function

All members of the class have been described in more detail in the previous step, and there are two forms for each member of a class: Public members, accessible from anywhere Private members, only inside the class can the method

First, the property attribute advanced usage can use an object method as a property Example: class foo:    def __init__ (self, age):         )         self.__age  = age     @property     def age (self):         return self.__age     @age .setter     

1the encoding of the Python code file. py file is ASCII encoded by default, and Chinese will make an ASCII-to-system default code conversion when displayed, and an error will occur: Syntaxerror:non-ASCII character. You need to add an encoding

Process ControlConditional judgmentif single branch : performs the appropriate action when a "condition" is established.Syntax structure:If condition: commandFlow chart:Example: If 3 is greater than 2, then the output string "very good"#!/usr/bin/

Contact Python for the first timeA little strange.I've been installing the information.It's fairly smooth.The Python is installed firstI am installing the 3.5.0-x86 (32-bit) versionPython installation package Download:

I. Object-oriented design significanceProcess-oriented program design is the core of process (pipeline thinking), the process is to solve the problem of the steps, process-oriented design is like a well-designed pipeline, consider when to deal with

See a lot of configuration articles, can not go through the process of normalThe resources used are up-to-date today:Python-2.7.8.amd64.msiOpencv-3.0.0-beta.exeNumpy-mkl-1.9.1.win-amd64-py2.7.exeSteps:1. Download the latest Python3.4.2 after

Queue: from collections import deque; Implementation saves the last few history, List = Deque (maxlen=6), then more than six records will delete the previous record.Heap: Import HEAPQ; The biggest feature is that the first popup element is always

python decoratorAn adorner (decorator) is an advanced Python syntax. Adorners can be used to process a function, method, or class. In Python, we have several methods for working with functions and classes, such as in Python closures, where we see

Tag:float   gdi    Add     two value image    shape    ext    Environment    color    presentation     This paper mainly uses K-nearest neighbor classifier to realize handwriting recognition system, training data set about 2000 samples, each number

First of all we have to think of a mall management system what module?1. Login 2 Add Item 3 Delete Item 4 query Item 5 program exitBut the above module is not enough, a management system should have a higher authority of the management account, it

Installed a CentOS 5.5, want to set up a python development environment, but still encountered a lot of problems, record the process:1. Python UpgradeView Python versionPython-vpython 2.4.3Because the change of Python3 is very big, still want to use

Python GC uses reference counts (reference counting) primarily to track and recycle garbage.On the basis of reference counting, through "mark-clear" (Mark and sweep) to solve the problem that the container object may produce circular reference,

This article is to introduce in detail is the basic syntax and advanced usage of Str.format () in Python programming, very detailed, with examples, I hope you can like 1. Introduction of Str.format in Python, we can use + to concatenate strings, and

The following small series for everyone to bring a Java concurrent programming _ thread pool use Method (detailed). Small series feel very good, now share to everyone, also for everyone to make a reference. Let's take a look at it together. One, the

Re module Preface: The RE module is used to manipulate the regular expressions of Python '.' The default match is any character except \ n, if you specify flag Dotall, match any character, including the newline ' ^ ' match character beginning, and

Jobs: Calculator Development (1) Realize subtraction and extension number priority analysis; (2) User input 1-2 * ((60-30 + ( -40/5) * ( -9-2*5/-3 + 7/3*99/4*2998 +10 * 568/14))-( -4*3)/(16-3*2)) and other similar formulas, you must parse the

This article mainly introduces the Python implementation of sparse matrix sample code, small series feel very good, and now share to everyone, but also for everyone to do a reference. Let's take a look at it with a little knitting. In engineering

This article mainly introduces the Python random generation of the module randomly use instances, this article directly to show example code, the need for friends can refer to the following code: #!/usr/bin/env python#coding=utf-8import random#