Mine

>>> a=[]>>> a.append(9)>>> a.append(21)>>> a.append(7)>>> a.append(2)>>> a.append(5)>>> a.append(7)>>> a.append(11)>>> a.append(7)>>> a.append(9)>>> print a[9, 21, 7, 2, 5, 7, 11, 7, 9]>>> a.sort()>>> print a[2, 5, 7, 7, 7, 9, 9, 11, 21]>>> a_sin_repetir=[]>>> for elemento in a:...     if elemento not in a_sin_repetir:...             a_sin_repetir.append(elemento)...>>> print a[2, 5, 7, 7, 7, 9, 9, 11, 21]>>> print a_sin_repetir[2, 5, 7, 9, 11, 21]>>>