
When the bracket operator appears on the left side of an assignment, 
it identifies the element of the list that will be assigned.</font><br />
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&gt;&gt;&gt; numbers = [17, 123]
&gt;&gt;&gt; numbers[1] = 5
&gt;&gt;&gt; print numbers
[17, 5]
</font></pre><font color="black">The one-eth element of <tt>numbers</tt>, which
used to be 123, is now 5.<br />
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You can think of 