[Tutor] First program
crp at cmc.net
Sat Mar 13 18:55:19 CET 2010
Luke Paireepinart wrote:
> On Sat, Mar 13, 2010 at 3:03 AM, Alan Gauld <alan.gauld at btinternet.com
> <mailto:alan.gauld at btinternet.com>> wrote:
> "Ray Parrish" <crp at cmc.net <mailto:crp at cmc.net>> wrote
> print "A %s with dimensions %sx%s has an area of %s." %
> (choice, height, width, width*height)
> Isn't it a little more understandable to use a construct like
> the following?
> print "The area of a " + Choice + "is " str(Width)
> + " x " +
> str(Height) + " equals " + str(Width * Height) + " square feet"
> It depends on where you come from.
> Those of us brought up on C or COBOL are used to separating the
> presentation from the data. Those brought up with PASCAL and BASIC
> are used to iterleaving data with presentation.
> One thing - you don't need all the str() calls in your example,
> print already calls str() for you. Also comma separators are
> better than + signs since the plus operation on strings is quite
> expensive - you create a new string for each addition.
> print actually doesn't call str if you use concatenation. So the
> str() calls are necessary if you do not use "," but use "+" instead.
> So there are at least 2 reasons why + is worse than comma.
> Another thing to be aware of is that if you use commas,
> print inserts a space in the string, which may be either an advantage
> or a disadvantage depending on what you're trying to do.
Ahhh, thank you for the clarifications. for the cases where spaces are
needed it the commas seem like a pretty good way to do it, but when I
need to add together stuff with no spaces I'll try the formatted method.
Thanks again, Ray Parrish
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