Teaching python lists

In [1]: notas = [1,2,3,4,5]

In [2]: len(notas)
Out[2]: 5

In [3]: notas[0]
Out[3]: 1

In [4]: notas[1]
Out[4]: 2

In [5]: notas[2]
Out[5]: 3

In [6]: notas[3]
Out[6]: 4

In [7]: notas[4]
Out[7]: 5

In [8]: notas[5]
---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
/home/mauro/projects/panera/mwapp/<ipython-input-8-fd66b449eadb> in <module>()
----> 1 notas[5]

IndexError: list index out of range