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Common ports: portservice21The default is ftp port, which mainly depends on whether anonymous is supported or weak password can be used22The default is shh port23The default is telnet port25The default is smtp service53The default is DNS123NTP161，162，8161SNMP service (8161 SNMP opened by IBM)389ldap community80http service443https service512 ...

day01 computer foundation and environment construction Course objective: let everyone understand the basic knowledge of computer and complete the construction of Python environment. Course summary: Fundamentals of computerThe essence of programmingIntroduction to PythonConstruction of Python environment 1. Fundamentals of computer 1.1 basi ...

summary: What is a sequential database? What is a time series database? The simplest definition is that the data format contains the data of Timestamp field, such as the temperature of a certain time environment, CPU utilization, etc. However, what data does not contain Timestamp? In fact, almost all data can be marked with a Timestamp field. ...

[OpenCV complete routine] 93 Histogram of noise model Welcome to pay attention "100 complete OpenCV routines" Series, continuously updating Welcome to pay attention "Python Xiaobai's OpenCV learning course" Series, continuously updating 2. Noise model The noise source in digital image mainly comes from the process ...

catalogue   1, Project background 2, Data source 3, Ask questions 4, Understanding data 5, Data cleaning 1. Import data 2. Select subset 3. Delete duplicate values 4. Missing value processing 5. Standardized treatment 6. Abnormal value handling 6, Analysis content 1. Monthly analysis of consumption 2. User distribution analysis ...

Official Python column 51, students stop, don't miss this article starting from 0! In the previous article, the academic committee proposed The idea of making current limiter based on Semaphore semaphore A simple implementation of sum current limiter. The code is running and seems to have no errors. However, careful readers will find that ...

catalogue 1, Inherit 2. The difference between inheriting the object class or not 3, Encapsulation 4, Class method, static method and attribute method 5, Polymorphism 6, Does python have private variables in a substantive sense? 1, Inherit Different from java inheritance, python supports multiple inheritance. For example, the Person cl ...

Color space type conversion Color model is an abstract mathematical model that describes the method of using a set of values (usually three or four values or color components) to represent color. Common color spaces include: GRAY color space (GRAY image)XYZ color spaceColor space crybHSV color spaceHLS color spaceCIELab color spaceCIELuv ...

catalogue divide and rule Merge sort python code implementation Time complexity Quick sort python code implementation Time complexity   divide and rule divide and conquer (D & C) -- a famous recursive problem solving method. The so-called "divide and conquer" is to divide a complex algorithm problem into equivalent sma ...

catalogue 1. Module 2. Package 3. Documents 4. Abnormal 5. Higher order function 1. Module 1.1 concept Python module is a python file, which is written in py ends with Python object definitions and python statements. Modules can define functions, classes, variables, and can also contain executable code 1.2 import module Mode 1: ...