class mylist(): def __init__(self,l): self.l = l def extend(self,index): diff = index + 1 - len(self.l) if diff > 0: self.l.extend([ None for x in range(diff) ] ) def __getitem__(self,index): # self.extend(index) ## depending on your taste return self.l[index] def __setitem__(self,index,value): self.extend(index) self.l[index] = value def __repr__(self): return self.l.__repr__() a = mylist([0,1,2,3]) print 'List: %s' % a # print a[5] ### this will throw an 'list index out of range' unless ### you comment out the bit in __getitem__ a[5] = 5 print 'List: %s' % a print a[5]
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