Python

1.AOPThe same code and repetitive functions are extracted from the inside of different classes to be reused.The adorner is a well-known design pattern, which is often used for scenes with cut-off requirements, more classic insert logs, performance

Python Standard Exception SummaryAssertionerror Assertion Statement (assert) failedAttributeerror attempting to access an unknown object propertyEoferror user input file End flag EOF (CTRL+D)Floatingpointerror floating-point calculation errorWhen

Development environment:Windows10x64python3.6Installed packages:Tkinter (Display interface)Pygame (play Music)#--Coding:utf-8--Import OSImport TkinterImport Tkinter.filedialogImport timeImport threadingImport Pygameroot = Tkinter. Tk ()Root.title ('

1. ModuleModule: A python code a set of C language code a bunch of ready-to-use functions, classesFunction of the module: Save memory consumptionModule classification: Built-in Module expansion Module custom module2. Common Modules##########

Inputnum = Re.match (' (\d+)-(\d+) ', userinput)Inputonenum = Re.match (' (^[1-9][0-9]*$) ', userinput)Re.sub Module Replace partial configuration fileOld = [' Zxjryzgi ', ' 20003 ', ' 10003 ', ' s3 ', ' = 3 ']new =

1.capitalize () First letter capitalization1 ' Hellopython ' 2 s1 = s.capitalize () # Initial capital 3print(S1) # Output Result: Hellopython2.upper () All caps, lower () all lowercase1 ' Hellopython ' 2 s2 = s.upper () # All caps 3 S21

Referenced from: 77502788Currently using ubuntu14.041. Add the python3.6 installation package and install it (you can also go to the official website to download the installation package)[HTML]View PlainCopy code

Python Settings EnvironmentWhen Python is installed, the environment variable is set in the advanced language of the computer's properties.The path in the environment variable changes to Python's Tree directory. You can open the Python command from

Download zip Tar.zip tar.bz2 Compressed files from GitHub or elsewhereUnzip into Directoryor Git clone.Python setup.py InstallThe exact location depends on the operating system and the path you set when you installed the Python

For CPU-intensive programs, you can use packaged classes such as Multiprocessing's process,pool to implement parallel computations in a multi-process manner. However, because the communication cost in the process is relatively large, the efficiency

One, yesterday content review second, today content summarizes 1.jquery introduction 1), why use jquery?　　　　　　    2), jquery two characteristics 3), the introduction of jquery Step 4), the entry function of Jqurey three notation 5), jquery and JS

1. intBit_lenth: The length of the binary2.strCapitalize (): Capital letter, other lowercase.Upper (): Convert all to uppercase, lower () opposite; Casefold () features similar to lower, but more powerful, less commonTitle (): Capitalize the first

First, choose the sort Select_sort#Finds the smallest value in an arraydeffindsmallest (arr):#Stores the smallest valuesmallest =Arr[0]#Stores The index of the smallest valueSmallest_index =0 forIinchRange (1, Len (arr)):ifArr[i]

Django Introduction:Django is an open source framework developed in the Python language, released in 2005. Early in the news and Content management site, providing a very powerful post-management system.Django Official website:

23 Object-oriented　　　　　 -----Special Methods1. Isinstance (obj, class name) determines whether an object is instantiated as such or instantiated by subclasses of this class.Class A:passClass B (A):pB1=b ()Print (isinstance(b1,b)) #

One, the file processing read operation1.f=Open' Chen granule ',encoding=' Utf-8 ')Data=f.read ()Print (data)F.close ()2. Open modeR W A3. Encoding encodingf=Open' Chen granule ',' R ',encoding=' Utf-8 ')Data=f.read ()# Print (data)4. Read a row of

Formatted output:Name = QJAge = 30Job = ItSalary = 6000Example 1: string concatenation method, not recommended, because it will open up more memory space in memory.info = "----------info of" + name + "'---------Name: "+ name +"Age: "+ Age +"Job: ' +

class Person (object):#self不是关键字, it is possible to change to other identifiers, but generally do not changedef run (self):Print ("Run")Def eat (Self,food):Print ("eat" + food)Def say (self):Print ("hello! My name is%s,i am%d years old "% (self.name,

I. Coding1. The earliest encoding is ASCII code, created by Americans. 8 bits 1 bytes2.GBK GB code 16 bits 2 bytes3.Unicode Universal Code 32 bits 4 bytes4.utf-8 : English 8-bit 1 bytesEurope 16 bits 2 bytesChinese 24 bit 3 bytes　　Computer storage

1. Static propertyFunction: Change the way the method in a class is called, without parentheses, as if the data property is being invoked the same way　　classFangjian (): Tag='888' def __init__(self,name,owner,wedth,length): Self.name=name