I asked a similar question on Stackoverflow and was told it was better asked here. So I'll ask it slightly rephrased.

I am working on a Django project, part of which will become a distributable plugin that allows the python/django developer to specify conditional form field display logic in the form class or model class. I am trying to decide how the developer must specify that logic. Here's an example:

class MyModel(models.Model):
    #these are some django model fields which will be used in a form
    yes_or_no = models.SomeField...choices are yes or no...
    why = models.SomeField...text, but only relevant if yes_or_no == yes...
    elaborate_even_more = models.SomeField...more text, just here so we can have multiple conditions

    #here i am inventing some syntax...i am looking for suggestions!!
    #this is one possibility
    why.show_if = ('yes_or_no','==','yes')
    elaborate_even_more.show_if = (('yes_or_no','==','yes'),('why','is not','None'))

    #help me choose a syntax that is *easy*...and Pythonic and...Djangonic...and that makes your fingers happy to type!
    #another alternative...
    conditions = {'why': ('yes_or_no','==','yes'), 
                  'elaborate_even_more': (('yes_or_no','==','yes'),('why','is not','None'))
                  }

    #or another alternative...
    """Showe the field whiche hath the name *why* only under that circumstance 
    in whiche the field whiche hath the name *yes_or_no* hath the value *yes*, 
    in strictest equality."""
    etc...

Those conditions will be eventually passed via django templates to some javascript that will show or hide form fields accordingly.

Which of those options (or please propose a better option) aligns better with conventions such that it will be easiest for the python/django developer to use? Also are there other considerations that should impact what syntax I choose?