python - Check preferences with configparser -

I have an application that can be started using some user preferences. To do this, I use the ConfigParser from the underlying package to the ConfigParser class. I have received a subclass of ConfigParser , to specify each time without having to specify / set some preferences for __getitem __ and __setitem __ applies the applicable sections, sub-sections and options.

Some of those priorities (working directory, logging level ...) are quite wise for my code, I would like to check them each time to modify one of their items. To do this, I currently think of two approaches:

1. Writing a method that examines each item of my preferences, each of them is modified is. Every time an item is changed, it is very simple but not very efficient.

2. Write a check_item method (check_logger, check_command_directory, check_blabla ...) for every preference and every time an item related checker is set, then it will be sent to Getattr (self, 'check_% s'% items) (item)

   I think the second approach would be better than before.

   Will you see some of those design options?

   Thank you very much

   • Make them pure python Can apply in;
   • Use a (trade) rule language like BPL to support Python for this project;
   • Use a hindrance-based system to check that the set of values ​​does not violate any rule directly or indirectly. You can see, for example, this is a type of "solver" - but it will inform you that there is no solution to the set of "priorities".

     The first choice for ordinary simple minor obstacles is my favor, though, as I explained it in comments, I do not think "check one item at a time" valid The approach to being - except for the simplest cases it is because some item values ​​can not be valid or valid based on the value of one or more other items < / P>