class - Converting String into Object Python -

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i've started learning python couple of weeks ago, , started writing text-based adventure game. i'm having trouble finding way convert strings instances of class, other using eval(), i've read isn't safe. reference, here's i'm working with:

class room(object):     """defines class rooms in game."""     def __init__(self, name, unlocked, items, description, seen):         self.name = name         self.unlocked = unlocked         self.items = items         self.description = description         self.seen = seen   class item(object):     """ defines class of items in rooms."""     def __init__(self, name, actions, description):         self.name = name         self.actions = actions         self.description = description    def examine(input):     if isinstance(eval(input), room):         print eval(input).description     elif isinstance(eval(input), item):         print eval(input).description     else:            print "i don't understand that."

if input string, how safely make class object , access data attribute .description? also, if i'm going in entirely wrong way, please feel free suggest alternative!

use dictionary:

lookup = {'room': room(), 'item': item()} myinstance = lookup.get(input) if myinstance not none:     print myinstance.description

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