[Tutor] IndexError: string index out of range

[Liam Clarke]

And that would be the simpler, more elegant way I mentioned in my
disclaimer. : )


On Tue, 2 Nov 2004 14:28:46 -0800 (PST), Danny Yoo
<dyoo at hkn.eecs.berkeley.edu> wrote:
> 
> > These handmade indexing is allways hard to code. Better to use a for-loop:
> >
> > for char in fruit:
> >     print char
> >
> > for index,char in enumerate(fruit):
> >     print [index], char
> >
> > (but while this is fine coding style, it's not such a challenging
> > learning example ;-)
> 
> Hi Michael,
> 
> For this particular example, I'd actually recommend using a backwards
> slice.  Here's an example:
> 
> ###
> >>> message = 'this is a test of the emergency broadcast system'
> ###
> 
> We're already familiar with slicing whole sections of a list:
> 
> ###
> >>> message[3:7]
> 's is'
> ###
> 
> But it turns out that slicing is even more versatile: we can ask Python to
> give us every other letter, for example:
> 
> ###
> >>> message[::1]
> 'this is a test of the emergency broadcast system'
> >>>
> >>> message[::2]
> 'ti sats fteeegnybodatsse'
> >>>
> >>> message[::3]
> 'tss sot eeyrdsst'
> ###
> 
> The third component of the slice is the "step" between elements.  By
> default, we "step" consecutive elements, but we can easily use a larger
> step to jump through our sequence.
> 
> And it turns out that we can select a negative step:
> 
> ###
> >>> message[::-1]
> 'metsys tsacdaorb ycnegreme eht fo tset a si siht'
> >>>
> >>> message[3:7:-1]
> ''
> >>>
> >>> message[7:3:-1]
> ' si '
> ###
> 
> Hope this helps!
> 
> 
> 
> _______________________________________________
> Tutor maillist  -  Tutor at python.org
> http://mail.python.org/mailman/listinfo/tutor
> 


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