How can a template determine whether a variable is a valid number (integer or floating-point), so that it can perform subsequent operations?

In Anqi CMS template development, we often need to handle various types of data.Among them, determining whether a variable is a valid number (whether an integer or a floating-point number), in order to perform corresponding mathematical operations or display logic, is a common requirement.Although the AnqiCMS template engine (based on Django template syntax) does not provide a directis_numericThese functions, but we can cleverly utilize their built-in filters and logical judgment tags to achieve this goal.

The Anqi CMS template language is designed to be simple and efficient, variables are usually output through double curly braces{{ 变量名 }}and logical control is used{% 标签名 %}. To determine if a variable is a number, the core is to try to convert it to a numeric type and observe the conversion result.

Core Tool: Number Conversion Filter and Logical Judgment

In the AnQi CMS template, there are several key filters that help us convert data types:

1. integerFilterAttempt to convert the variable to an integer. If the variable itself is an integer or a string that can be converted to an integer (such as "123"),