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The meaning of i + + equihyphenation ++i i Add 1 and then participate in other operations --i i Participate in other operations after subtracting 1 i++ i After participating in the operation, i The value of is increased by 1 i-- i After participating in the operation, i The value of is subtracted by 1 eg: i=5; ...

Operator (continued from 12.29) 1.1 arithmetic operators 1.2 relational operators 1.3 bit operator 1.4 assignment operator =: assign the right to the left, a=2, a=b +=: add left and right, assign value to left a+=b, equivalent a=a+b -=: left minus right, assigned to the left a-=b, equivalent to a=a-b *= /= %= The assignment operator is a right ...

The first difficulty in Python learning -- function. People who learn in this place feel that there is nothing. If they haven't learned, they stare when they learn. Don't panic. Learning programming is like this. Learn it first. From the perspective of God, stick to clock in. I write one article a day and you can learn one article two days.Func ...

Several common classes in Java enumeration Enumeration refers to a type consisting of a fixed set of constantsKeywords: enumEnumeration can have methods and properties, but generally not public enum Ennum { L1,L2,L3 } public class Application { public static void main(String[] args) { Application application = new Applicatio ...

1, Core thread concept 2, Three ways to create threads Common method calls and multithreading 1. Inherit Thread class (key) Method 1 of creating a Thread: inherit the Thread class, rewrite the run() method, and call start to start the Thread Multithreading example 1 Multithreading can download multiple pictures at the same time First, ...

filter,map,reduce,zip,enumerateThese functions are called high-order functions in Python. This article mainly studies their usage.filterThe prototype of filter function is as follows:filter(function or None, iterable) --> filter objectThe first parameter is the judgment function (the return result needs to be True or False), and the second i ...

1, Lists and tuples1. Why should lists and tuples always be put togetherThe basic usage of lists and tuples has been well studied in the basics section. You should keep a basic impression that lists and tuples are an ordered collection that can place any data type, or can be used as a container.The two most direct differences between them are t ...

Python operation SQLite databaseKnow SQLite databaseSQLite database will be automatically installed on your computer after installing Python. Through it, data can be permanently stored on the local computer. Someone must say that we can store data in files. Why should we store it in the database? Well, it must be comfortable to use (it's the sa ...

1 Introduction to ArrayList In the collection framework, ArrayList is a common class that implements the List interface. The specific framework diagram is as follows: [description] ArrayList implements the RandomAccess interface, indicating that ArrayList supports random accessArrayList implements the Cloneable interface, which indi ...

Words written at the beginning After the end of the postgraduate entrance examination in 2021, I feel that time has passed quickly. The postgraduate entrance examination not only brings me systematic learning of basic knowledge, but also teaches me how to learn and think about myself. It also gives me the courage and perseverance to face anyth ...