ods modify the argument and
 return <tt>None</tt>. This is the opposite of the string methods,
 which return a new string and leave the original alone.<br />
<br />
If you are used to writing string code like this:
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word = word.strip()
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<font color="black">It is tempting to write list code like this:
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t = t.sort()           # WRONG!
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