impor tcollections

class Unsorted_Map (collections.MutableMapping):
'''classdocs'''
class _Item(object):
'''wedesignthatapair of key−v alueisa map’s item'''
def __init__ ( self , k , v ):
 self._key = k
self._valu e = v
def __eq__(self,other ):
return self._key == other._key
def __ne__(self ,other ):
return not (self == other)
def __lt__ (self ,other):
return self._key <other._key