Reload functions of Python

The reload () function loads the previously imported modules again. Reload includes the analysis process and initialization process of the application when the module is initially imported. In this way, the modified Python module can be reloaded without exiting the interpreter.

Note:
1. If the module is syntactically correct but fails during initialization, the import process cannot properly bind the module name to the symbol table. In this case, you must use the import () function to load the module before it can be reloaded.
2. The reloaded module does not delete the registration items of the original version of the module in the symbol table.
3. If a module uses from... Import... To import objects from another module. The reload () function does not redefine the imported objects. You can use import... To avoid this problem.
4. The re-loading module of the provided class does not affect any existing instances of the provided class. The existing instances continue to use the original method definition, and only new instances of the class use the new format. This principle applies to derived classes as well.