Python

There are many built-in decorators inside Python, and they all have special features that are summarized below.Series Articles A single-instance pattern of Python design patterns (i) Summary of common creation patterns of Python design

A process is a system that allocates the smallest unit of resource allocation, a thread is an entity of a process, a basic unit of CPU dispatch and dispatch, and is a smaller unit that can run independently than a process. The process has

Keywords:Gradient descent: It is to let the data along the direction of the maximum gradient, that is, the maximum function derivative drop down, so that it quickly close to the results.The formula for cost functions is too long to be played here.

To introduce you to the object hhhhPackagingFor example, the messy data is still on the list, and the data-level encapsulationPackage common code into a function that encapsulatesWhat the appearance characteristics (static) can do (dynamic)Object =

1. First of all, for the object to be manipulated, for non-mutable objects, such as string, number, tuple, and so on, these three operations are equivalent, are referenceImport CopyA= ' Apple 'B=aC=copy.copy (a)D=copy.deepcopy (a)Print (ID (a))Print

Implement HTTP service via Python This HTTP service allows you to share the download directory Simplehttpserver use Method 1 to enter the directory you want to share 2 execute the command python-m simplehttpserver port number Note that the default

The __new__ () function can only be used for modern classes that inherit from object.First look at the definition of the __new__ () method in the object class:classobject:  @staticmethod# known case of __new__  def__new__(cls, *more): # known

PortscanPort scanProject Address: Https://github.com/sgjr/portScanNotice of UseNeed to install NMAP command and Python-nmap module before useyum install nmappip install python-nmapHow to useUsage: portScan.py [Options]Options: --version

1. What is a thread?A process is the unit in which an operating system allocates a program to execute resources, and a thread is an entity of a process that is the unit of CPU dispatch and allocation. A process must have a main thread, and we can

%s represents a placeholder, substituting s to D for integers, and s to f for floating point.Name = input ("Name:")age = Int (input ("Age:"))Job = input ("Job:")Salary = input ("Salary:")msg = "'------------Info of%s----------------------Name:%sAge:%

Allow_redirects=false not redirected# Get redirected AddressesLOC = R.headers# relative AddressHost = ' https://i.cnblogs.com/'url = host+ ' editposts.aspx?opt=1 'loc = r.headers[' Location ']URL1 = host+loc # stitching out redirected addresses#

Recently in the study of "Flask Web development: Python-based Web application development," a book in the Mail chapter, in the configuration encountered a problem, after consulting the data to find a solution. In this summary, if you are in the

1.2 lists converted to dictionaries#encoding =utf-8List1=["A", "B", "C"]list2=[1,2,3]d={}For I in range (len (list1)):D[list1[i]]=list2[i]Print (d)2. Using the built-in function zip3. Find the number of times for all data types in a list #encoding

The IF statement is used for the execution of the control program, in the basic form:If judgment condition: EXECUTE statement ... Else: Execute statement ...Where the "judging condition" is established (not 0), the following statements are

This essay is I after learning, my own understanding and find relevant information summed up, there is not correct, but also hope everyone to me point out. Development language? Advanced language: python,java,php,c#,c++, etc.Low-level language: C

OS Module1 ImportOS2 Import Time3 Print(OS.GETCWD ())#py Execution file path, not the same as under console4 5Os.chdir (R'/home/nizhipeng')#change the current script directory, equivalent to a CD, the work environment has changed6 Print(OS.GETCWD ())

1Capitalize ()Converts the first character of a string to uppercase2Center (width, Fillchar)Returns a string that specifies the width of the center, Fillchar is a filled character, and the default is a space.3Count (str, beg= 0,end=len

row = 1while row for row in range(1, 10): for col in range(1, row+1): print("{} * {} = {}".format(col, row, row*col), end="\t\t") print("") row = 1while row for row in range(1, 10): for col in range(1, row+1):

Both STR () and repr () are used as character representations of an object.Example of 1 str ():s = ' Hello, Geeks. ' Print str (s) print str (2.0/11.0)Output Result:Hello, geeks.0.181818181818.Example of 2 repr ():s = ' Hello, Geeks. ' Print repr (s)

HTTPS:Geturl = ' HTTPS://WWW.JUHE.CN/DOCS/API/ID/39 'r = Requests.get (URL) #发送get请求Print (R.status_code) #打印状态码Print (r.headers) #打印返回的报头 (head)Print (R.text) #查看返回结果的文本形式 (body part)Sslerror: Certificate Issue:Method 1: Check if the Faddler is