Cleaner way to represent Rules (if-else) in Python -

i trying find design pattern (or maybe algorithm) me write these rules in cleaner way. suggestions?

def get_rules(user, value):     if 500 <= value < 5000 , not user.address:         return [request_address]      if value >= 5000:         if not user.address , not user.phone:             return [request_address, request_phone]         if user.address , not user.phone:             return [request_phone]         if not user.address , user.phone:             return [request_address]      # potentially ~20 more conditions here based on various attributes of user     return [states.request_none] 

note: not looking rules engine since don't want complicate code adding "business friendly" dsl in python. python simple language write these rules.

interesting read: http://martinfowler.com/bliki/rulesengine.html (but still trying stay away "framework" me).

you're checking lots of different combinations "if , not b else check not , b else check not , not b" strategy figure out combination of requests need send.

instead, check you're missing:

missing = [] if not user.phone:     missing.append(request_phone) if not user.address:     missing.append(request_address)  return missing or [request_none]