10 recommended articles about logical judgment

This is an article about Python, mainly introducing logical judgments and operators. (1) Logical judgment: If you want to implement a complex functional program, logical judgment is essential. The most basic standard for logical judgment: Boolean type. The Boolean type has only two values: True and False, which correspond to 1 and 0 in the Python language. Enter the following code in Pycharm, and you will get True or False feedback after running. 1 print(1 > 2) 2 print('m' in 'member') 3 print(7 >= 7) 4 print(3 != 3)Here, we call an expression that can return a Boolean value a Boolean expression. There are many ways to express Boolean expressions, the following are mainly introduced. (2) 1. Comparison operator: If the comparison formula is established, True is returned; if not, False is returned. Common

1. Python: Logical judgment and operator examples

##Introduction: This is an article about Python, mainly introducing logical judgments and operators. (1) Logical judgment: If you want to implement a complex functional program, logical judgment is essential. The most basic standard for logical judgment: Boolean type.

2. Getting started with regular expressions

# #Introduction: cjx has recently been working on a crawler project, and urgently needs to capture the content he wants in the page, but obtaining it through logical judgment is too complicated.

3.

SQL statement skills: cleverly use OR to achieve logical judgment when querying

##Introduction: DECLARE @fieldname varchar(50) DECLARE @fieldvalue nvarchar(100) SET @fieldname='chassisno' --One or none of chassisno, plateno, owner, contacttelno can be passed here Pass SET @fieldvalue='Zuowenjun' IF @fieldname = 'chassisno'

4.

html - Why is the debugging information written in the uploadify.php file when using the uploadfiy plug-in? No output

Introduction: When using the uploadfiy plug-in, I hope to write some logical judgments in uploadify.php, but when debugging, there is no output, echo/var_dump, etc. do not work.

5.

Simple factory pattern php implementation c#simple factory pattern factory pattern java java simple factory pattern example

Introduction: Simple factory pattern: PHP implementation of simple factory pattern: Simple factory pattern is also called static factory method pattern. Its main function is to instantiate (create) objects of each class through a simple factory class without the need to instantiate through new. object. The advantage is that the factory class contains certain logical judgments and will dynamically instantiate related classes according to the client's selection conditions. The disadvantage is that when a new functional class needs to be added, the factory class needs to be modified. The following content uses a simple calculator program as a case study

6.

ajax technology What is Ajax refreshless technology?

Introduction: ajax technology: ajax technology What is Ajax refreshless technology? : The browser instantiates an Ajax object, which sends an HTTP request and carries certain parameters and transmits it to the background. The background server receives these parameters, filters the passed parameters at the same time, and makes logical judgments. If database operations are required, the data must be retrieved and formatted. Returned to the front-end client, the data obtained by the front-end is processed, the DOM elements are obtained, and the data is placed locally. This enables countless new technologies. It is generally used mainly for registration module email and user verification.

7.

The legendary... file upload_PHP tutorial

Introduction: The legendary... file upload. When uploading images in file upload, you must first set the format, size (MAX_size), and attributes (type) of the image. Then use logic to judge. Finally, create a form/form form and upload it.

8. TWIG’s tests learning_PHP tutorial

Introduction: TWIG’s tests learning. Make logical judgments. Currently supported are divisibleby null even odd same as constant defined empty divisibleby Check whether it can be divisible {% if loop.index is divisibleby(3) %} ... {% en

##9 . submit and onsubmit (transfer), submitonsubmit_PHP tutorial

Introduction: submit and onsubmit (transfer), submitonsubmit. Submit and onsubmit (transfer), submitonsubmit occurs in sequence: onsubmit - submit 1. Prevent form submission: script function submitFun(){ //Logical judgment return true; //Allow form submission //Logic

10. A piece of logical judgment cannot achieve the purpose

Introduction: A piece of logical judgment cannot achieve the purpose. I want to ask for help using only one page to display the news system The three functions: "index.php?news_title=xxx?news_class=xxx" need to achieve the following purposes: 1. When the news_title and news_class elements are both empty or have values, the page displays the title list of all news; 2. , when in the two elements of news_title and news_class,

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