I'm totally confused by this code:<br><br>Code:<br><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">a = None<br>b = None<br>c = None<br>d = None<br>
x = [[a,b],<br>     [c,d]]<br>e,f = x[1]<br>print e,f<br>c = 1<br>d = 2<br>print e,f<br>e = 1<br>f = 2<br>print c,d<br><br></blockquote>Output:<br><br><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">
None None<br><span style="color:rgb(255,0,0)">None None</span><br>1 2<br> </blockquote><div><br>I'm expecting the code as:<br><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">
None None<br>
<span style="color:rgb(255,0,0)">1 2</span><br>
1 2<br> 
<br></blockquote><div><br>What's wrong?<br>And this question made my GUI program totally out of control.<br>Thanks<img goomoji="338" style="margin: 0px 0.2ex; vertical-align: middle;" src="cid:338@goomoji.gmail"> <br>
</div></div>