What are the characteristics of python custom functions?

pythonThe characteristics of custom functions are as follows:

1. Reusability: Custom functions can be called and used anywhere in the program, which improves code reusability and avoids repeatedly writing code with the same function.

2. Scalability: Through custom functions, complex code logic can be encapsulated inside the function, making the program structure clearer and easier to maintain and expand.

3. Modularization: Custom functions can decompose a large program into multiple small modules, each module is responsible for completing a specific function, thus making the code more modular and easier to manage.

4. Parameter flexibility: Custom functions can accept different types and numbers of parameters, and the functions can be customized through the parameters of the function.

5. Return value: A custom function can return one or more values, and the calculation result of the function can be used as the return value to facilitate subsequent operations in the program.

6. Testability: Custom functions can be tested independently. You can provide different input parameters to check whether the output results of the function meet expectations, thereby improving the reliability and testability of the code.

7. Encapsulation: A custom function can encapsulate a piece of code inside the function, hiding the internal implementation details, and only exposing a function interface to external callers, which improves the security and readability of the code. .

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