[Tutor] slices

[Will Harris]

Is there an easy way to slice the last set of characters off a string when I
don't know the length of the string? For example say I have a list of words
like
this
though
weather
I want to get the last 2 characters from each. But so far nothing I have
tried has seemed to work. Currently I am doing something like:

#!/usr/bin/python
import sys

for word in sys.argv[1:]:
print word[-3:-1]

I have tried to change the numbers around but I always seem to end up at the
wrong place of the string. If I new the length each time I could just do a
positive.
Doesn't this work in the form of:

t h i s
0 1 2 3
-4 -3 -2 -1

Did I miss something somewhere in some tutorial that someone would be kind
enough to point me to?
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