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>>> class Node(object):
...     def __init__(self, n): self.name = n
...     def getName(self): return self.name
...
>>> n = Node('abc')
>>> n.getName()
'abc'
>>> node('xyz')
<__main__.Node object at 0x7f7dbc033f50>
>>> def node(name): return Node(name)
...
>>> n = node('xyz')
>>> n.getName()
'xyz'
>>> {x.getName(): x for x in map(node, ["aaa", "bbb"])}
{'aaa': <__main__.Node object at 0x7f7dbc03d0d0>, 'bbb': <__main__.Node object at 0x7f7dbc03d110>}
>>> Node.__repr__ = lambda(self): "Node('{}')".format(self.getName())
>>> {x.getName(): x for x in map(node, ["aaa", "bbb"])}
{'aaa': Node('aaa'), 'bbb': Node('bbb')}