TypeError: sequence index must be integer, not 'slice'
</source>
Now let's try in relax.
<source lang="python">
USER@MACHINE: $ relax
File "<console>", line 1, in <module>
TypeError: sequence index must be integer, not 'slice'
# Convert to list from xrange object.
relax> y=list(range(10))
relax> print y[:3]