class ItemInSet (Exception): pass class Set ( object ): def __init__ (self): self.set = [] self.items = 0 def isEmpty ( self ): return self.items == 0 def add ( self , item ): if self.inSet(item): raise ItemInSet , "Item is already in the set" else: self.set.append(item) self.items += 1 def inSet ( self , item ): return item in self.set def remove ( self , item ): if self.inSet(item): self.items -= 1 self.set.remove(item) else: raise ItemInSet , "Item is not found in the set" def __str__ ( self ): return str(self.set) def __len__ ( self ): return self.items x = Set() x.add(10) x.add(20) x.add(30) print x #x.add(10) a = x.remove(10) print x
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