RE: Python: What Happens When This If Executes?
- From: "Homme, James" <james.homme@xxxxxxxxxxxx>
- To: "programmingblind@xxxxxxxxxxxxx" <programmingblind@xxxxxxxxxxxxx>
- Date: Wed, 3 Nov 2010 10:27:34 -0400
Hi Jim,
Is the code execution more efficient when writing it like this?
Thanks.
Jim
Jim Homme,
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From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Jim Dunleavy
Sent: Wednesday, November 03, 2010 7:11 AM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: Python: What Happens When This If Executes?
Hi Jim,
The feature is called comparison chaining and is equivalent to
if board[row[0]] == board[row[1]] and board[row[1]] == board[row[2]] and
board[row[2]] != EMPTY:
except that the operands are only evaluated once.
It's covered in chapter 5 Expressions, of the Python reference.
--Jim
----- Original Message -----
From: Homme, James<mailto:james.homme@xxxxxxxxxxxx>
To: programmingblind@xxxxxxxxxxxxx<mailto:programmingblind@xxxxxxxxxxxxx>
Sent: Tuesday, November 02, 2010 2:42 PM
Subject: Python: What Happens When This If Executes?
Hi,
I understand that this statement compares three values to see if they are the
same, and that they are not the value called Empty, which is a global variable
filled with a space, but how does it do this?
if board[row[0]] == board[row[1]] == board[row[2]] != EMPTY:
Thanks.
Jim
Jim Homme,
Usability Services,
Phone: 412-544-1810. Skype: jim.homme
Internal recipients, Read my accessibility
blog<http://mysites.highmark.com/personal/lidikki/Blog/default.aspx>. Discuss
accessibility
here<http://collaborate.highmark.com/COP/technical/accessibility/default.aspx>.
Accessibility Wiki: Breaking news and accessibility
advice<http://collaborate.highmark.com/COP/technical/accessibility/Accessibility%20Wiki/Forms/AllPages.aspx>
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