1. Mathematical module provides many mathematical operation functions;

2. Complex number module (cmath) provides the function of complex number operation;

3. The random module provides the function of generating random numbers;

4. The time and calendar module provides functions that can handle dates and times.

Note: Before calling the system function, you should use the import statement to import the corresponding module.

This statement copies the function code defined in the module into its own program sequence, and then you can access any function in the module before the function name by adding the "module name".

I hope I can help you.