>>> vanused={"Juku":14, "Mati":15}
>>> print vanused
{'Juku': 14, 'Mati': 15}
>>> vanused["Kati"]=13
>>> print vanused
{'Juku': 14, 'Mati': 15, 'Kati': 13}
>>> del vanused["Mati"]
>>> print vanused
{'Juku': 14, 'Kati': 13}
>>> print vanused.keys()
['Juku', 'Kati']
>>> print vanused.has_key("Kati")
1
>>>