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preface   as a sophomore, the author wrote a software based on QT, but the teacher refused to let us design games (GaN!) After consulting the teacher, he said let me design a video player, so I watched the video and typed the code myself (because the teacher's teaching level was too poor)    to tell the truth, it was a litt ...

1. Automatic document processing 1.1 reading and writing documents How to use python to create, read and save files on the hard disk. 1.1.1 file and file path Two attributes of a file: path and file name. Path: location of the file on the computer ------ D:\datawhale File name: refers to the name of the file in this location----- "Fi ...

Summary of basic knowledge of Python... Life is short. I use python preface Python is an easy to learn and powerful programming language. It provides efficient high-level data structure and simple and effective object-oriented programming. Python's elegant syntax and dynamic typing, as well as the essence of interpretive language, make it ...

For example, there is now a Person class: public class Person { private Long id; private String name; public Person(Long id, String name) { this.id = id; this.name = name; } public Long getId() { return id; } public void setId(Long id) { ...

catalogue 1, Traversal list 2, Avoid indent errors 1. Forget indent 2. Forget to indent additional lines of code 3. Unnecessary indentation 4. Unnecessary indentation after loop 5. Missing colon III. create a digital list 1. Use the function range() 3. Perform simple statistical calculations on the list of numbers 4. List parsing IV ...

In this article, we begin to study lists in Python and learn how to operate list elements efficiently. List introduction A list is an ordered collection of elements. Python uses square brackets ([]) to define the list. The following is an empty list: empty_list = [] Typically, a list contains one or more elements. To distinguish multiple e ...

I Interview questions and analysis 1. Today's interview question How do I sort the List collection? How to sort the List set using Lambda expressions? 2. Topic analysis The knowledge points investigated in this topic are still related to the List set, but its difficulty has been greatly reduced compared with the previous set content. ...

Basic knowledge day6 - List 01. Slice of list 1. Slice - get some elements The slice result is a list Syntax: list [start subscript: end subscript: step size] explain: Start subscript - subscript value (0 and - 1 are OK); Determine the starting point of the effective range of the slice, which can be obtained : - Fixed writing End subscript ...

Tuples and dictionaries 1. What is a tuple Tuple is the container data type: take () as the flag of the container, and multiple elements in it are separated by commas: (element 1, element 2, element 3...) Tuples are immutable (can only be queried): tuples are ordered - subscript operation is supported Element: like the list, there is no requ ...

catalogue Foregoing Structure of container Singleton set implementation class List--ArrayList Capacity expansion mechanism of ArrayList Add element Get element Replace element Delete element Find the location of the element Find element exists List size Judge whether the list is empty Convert to array clear list Get list iterat ...