native.py

class NativeDictionary:
    def __init__(self):
        self.dictionary = {}

    def add_key_value_pair(self, key, value):
        self.dictionary[key] = value

    def get_value(self, key):
        return self.dictionary[key]

    def remove_key(self, key):
        del self.dictionary[key]

d = NativeDictionary()


#DONT CHANGE
d.add_key_value_pair('gina', 4) # d['gina'] = 4
print d.get_value('gina') # => 4

try:
    d.get_value('pablo') # ERROR!
except KeyError:
    print 'it raised an error'

d.add_key_value_pair('pablo', 2)
print d.get_value('pablo') # => 2
d.remove_key('pablo')
d.get_value('pablo') # ERROR!