P304, Appendix A, Answer 3

jc. · August 4th, 2015, 10:30 AM

The final line reads:

Code:

print('I don't like your color choice')

But this will generate:

Code:

SyntaxError: invalid syntax

It could read:

Code:

print("I don't like your color choice")

Could someone explain how the tuple(?) is accessible within the if/elif chain, as it is not assigned to a variable? I'm presuming it is just witchcraft! Many thanks.

Alan G · August 4th, 2015, 03:13 PM

Quote:

Originally Posted by jc.

The final line reads:

Code:

print('I don't like your color choice')

But this will generate:

Code:

SyntaxError: invalid syntax

You are quite right. It should be double quotes on the outside of the string.

Quote:

Originally Posted by jc.

Could someone explain how the tuple(?) is accessible within the if/elif chain, as it is not assigned to a variable? I'm presuming it is just witchcraft! Many thanks.

Hmm, I messed this one up didn't I?
The problem is that the first line should not have parens around the
variable names.

it should look more like

red,blue,green = range(3) # no parens.

If you'd asked this question last week I could have consulted the original source
code but sadly, while upgrading to Windows10 at the weekend, I managed to
wipe the drive with all the book source code! But certainly the code in
the manuscript includes parens. My bad!

sorry,

Alan G.

jc. · August 4th, 2015, 04:10 PM

Thanks for another quick response Alan and for clearing up my confusion. Please don't get the impression that I dislike the book.

I think it was brave of you to adopt Win10 so early, though it could of been worse...

()

I have the upgrade in the wings for my wife's PC, but my own machine will be sticking with CentOS.

jc. · August 4th, 2015, 04:11 PM

My URL didn't post, trying again, but probably the topic is causing the problem...

http://www.dailymail.co.uk/sciencete...ow-repeat.html

Alan G · August 4th, 2015, 06:05 PM

Quote:

Originally Posted by jc.

I think it was brave of you to adopt Win10 so early, though it could of been worse...

Not that brave, I have 3 PCs. My main one is Linux(Mint), I also have a
Windows XP box(!) and a Windows 8.1 box. I need them for testing/upgrading
old bits of software and new Windows applications respectively.

Its only the 8.1 that got upgraded, but that's the one I used to write the
code for the book. :-(

Alan G.

jc. · August 5th, 2015, 03:52 AM

Well that XP box might yet outlive your Win10 box. Mint, phew!