Use python class of __int__ and __str__

class F.: 

    DEF __str __ (Self): 
        return 'Hello China' 

    DEF __int __ (Self): 
        return 123 

RES = F. () 
Print (STR (RES)) # result Hello China 
Print (int (RES)) # result 123 

when the object we use str conversion classes created, it will automatically look for class __str__ function, 
when the object we use int conversion classes created, it will automatically look for class __int__ function