A Python dispatcher pattern

import sys
##  the format of the dictionary is as follows:
##  'command': {'sub command' :
##    {'function':'module.class.function'}
##  }
dispatchDictionary = {
'add' : {'friend' :
{'function':'core.friends.friends.addFriend', 'help':'blah'}},
'connection' : {'info':{'function':'core.class.function','help': 'prints help'},
'help' : {'function' : 'core.shell.help.print_help'}},
'list' : {'files' : {'function' : 'core.shell.file.f_list'}},
'get'  : {'file' : {'function' : 'core.shell.file.f_get'}}
}

class dispatch:
 def __init__(self):
     pass
  
 def dispatch(self, input):
     ## the values 'in' _should_ be a list ['hi', 'hi']
     try:
         value = reduce(dict.get, input[:-1], dispatchDictionary)
     except (TypeError), e:
         ## empty
         print e
         return
  
     key = input[-1:][0]
     try:
         ## make sure it really exists
         value[key]
     except KeyError:
         key = input[:-1][0]


     if key not in value:
         if 'function' not in value:
             ## no function key
             return
         if value['function'] is None:
             ## empty
             return
         self.execute(value['function'], input)
      
     elif key in value:
         if 'function' not in value[key]:
             ## no function key
             print value[input[-1:]]
             return
         if value[key]['function'] is None:
             ## empty
             return
         self.execute(value[key]['function'], input)
              
  
          
 def execute(self, command, input):
     if not input[-1:][0][:1] == '[' and not input[-1:][0][-1:] == ']':
         formatted = False
     else:
         formatted = True
  
     cSplit = command.split('.')
     try:
         __import__(cSplit[:1][0])
     except ImportError, e:
         print e
     try:
         module = sys.modules[cSplit[:1][0]]
     except Exception, e:
         print e
         return
  
     if formatted:
         splittable = input[-1:][0][1:-1]
         funcInput = splittable.split('/')
     else:
         funcInput = input[1:]

     ## create an instance
     Class = self.r_getattr(module, '.'.join(cSplit[1:-1]))
     c = Class()
     func = self.r_getattr(c, '.'.join(cSplit[-1:])) 
     func(funcInput)
  
 def r_getattr(self, object, attr):
     return reduce(getattr, attr.split('.'), object)

 def r_setattr(self, object, attr, value):
     attrs = attr.split('.')
     return setattr(reduce(getattr, attrs[:-1], object), attrs[-1], value)

 def add(self):
     pass