Python

Matplotlib is a common data visualization tool used in Python, and is a bit similar to MATLAB. Calls are simple and powerful. You can install it from the command line pip install matplotlib under Windows. Here are some examples of basic use: 1.

InheritedSingle Inheritance:#类定义class people: #定义基本属性 name = ' Age = 0 #定义私有属性, private properties cannot be accessed directly outside the class __weight = 0 #定义构造方法 def __init__ (self,n,a,w): self.name = n

#1, to calculate the factorial of a function with recursiondef MYFAC (n): #用循环实现 s= 1 for i in range (1,n+1): s*=i print (s) MYFAC (5) def MYFAC (n): #用循环实现 if n==1: return 1 return N*MYFAC (n-1) Print (MYFAC (5))#2

#-*-Coding:utf-8-*-class A (object): Def __init__ (self, Xing, gender): # ！ #1 Self.namea = "AAA" #! #2 self.xing = xing #! #3 Self.gender = gender #! #4 Self.funca () def Funca (self): print ("Function A:%s"% Self.namea) class B (a): Def __init__

#python polymorphismclassDog ():defEat (self):Print("I am dog, eat something.")classCat ():defEat (self):Print("I am cat, eat somthing.")#polymorphic Invocation FormdefAnimal_eat (one): One.eat () d=Dog () C=Cat () animal_eat (d) animal_eat (c)"

Socket conceptSockets are also commonly referred to as "sockets," which describe IP addresses and ports, and are a handle to a chain of communication, where applications usually make requests to the network through "sockets" or respond to network

# 1, the implementation of a commodity management procedures.# #输出1, add Item 2, delete Item 3, view product# Add Item:# Product Name: XXX If the product already exists, it indicates that the product already exists.# Commodity price: XXXX Quantity

Python installation module NumPy A workaround for a situation that cannot be uninstalledPython needs to update the NumPy module when installing Seaborn, but the update fails with the following error output:　　Cannot uninstall ‘numpy‘. It is a

Python locals () function actionHttp://www.runoob.com/python/python-func-locals.htmlThe locals () function returns all local variables of the current position in the dictionary type.For functions, methods, lambda functions, classes, and class

JSON is a common data type, all languages are known (the return value of an interface is typically a JSON string) The key value in the K-V {} JSON must be wrapped in double quotation marks to verify that the JSON format is correct www.bjson.com

2.random Module#随机浮点数Random.random () #生成0到1之间的随机浮点数, cannot be specified by itselfRandom.uniform (1,10) # can specify#随机整数Random.randint (1,7) #生成1到7之间的随机整数1 #随机选取0到100间的偶数:Random.randrange (0,101,2) #生成随机整数#随机字符Random.choice (') #传的是一个序列

File IO Common operationsOpen opensRead ReadsWrite writesClose closesReadLine Line ReadReadLines Multi-line ReadSeek file pointer operationTell pointer positionOpen actionOpen (file,mode= "R",

conditional Statements1) formatif Conditions: Print (' 123'Else: print(' 456 ')Print (' ... ') must be indented than if or else, the code that is indented between if and else is the IF, which is called the code block, which is equivalent to

Today, when you write a program, it is important to find some updates to the list. Ls=[' A ', ' B '] For i in LS: I=i.upper ()Print (LS) So the result of the output LS is still [' a ', ' B '], if you want to update the list, then the

In the development of computer programs, as the program code more and more, in a file code will be more and more long, more and more difficult to maintain.In order to write maintainable code, we grouped many functions into separate files so that

? Strings are sometimes tricky *1.>>> a = "some_string">>> id(a)140420665652016>>> id("some" + "_" + "string") # 注意两个id是相同的1404206656520162.>>> a = "wtf">>> b = "wtf">>> a is bTrue>>> a = "wtf!">>> b = "wtf!">>> a is bFalse>>> a, b = "wtf!", "wtf!">>

You don't know the PythonInteresting python features and amazing snippets of code.Python is a well-designed, high-quality, interpretive programming language that provides us with many features that make programmers feel comfortable. Sometimes,

All the files stored in the computer as a binary form, but we sometimes need to convert the binary to GBK or utf-8 form, encoding the time encode decoding decode, the following is a brief description of the Python binary in the file transfer process

#-*-coding:utf-8-*-# test file is named: # text.txt# Test file content is: # abcdefg# after each operation to restore the file # r# read-only open the file, the file is not writable # to open the file does not exist when the error # file will be

Basic Python sectionPython Foundation OnePython Foundation IIPython data Type one (focus on the various operations of the string)Python data type two (list and tuple)Python data type three (dictionary)The difference between IS and = = and encoding,