Updating the same list with square values : <p>I want to  declare a list in python3 and then update it with square values.
e.g. </p>

<pre><code>list1 = [1,2,3,4]
</code></pre>

<p>and Output should be the same list with square values:</p>

<pre><code>list1 = [1,4,9,16]
</code></pre>

<p>I don't want to use another list.
Please help?</p>
