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On 02/05/15 10:58, Jag Sherrington wrote:
Hi Alan thank you for your help have done what you sugested and still the results don't add up? # how many hot dogs left dogsleft = (packdogs * 10 and - dogs_needed)
You removed the comma. But you added an 'and'. You need a straight math equation here. By including 'and' you make it a boolean expression and the way Python evaluates that is to work out the left side and if it is false(zero) return the value. if it is true(non zero) then it works out the right side and return that. This is done vbecause of the rule in boolean algebra that TRUE and B = B So in your case it evaluates it as: (packdogs * 10 and - dogs_needed) First it works out packdogs * 10, which is 20, and therefore True. It then returns -dogs_needed which is -20 as the result. That's why you get what you get. The fix is just to do the math and nothing else, no commas, no 'and'. HTH -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
