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First of all, thanks to Nick for creating this site and opening it up to teachers like myself. It is much appreciated!
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Next, if you feel these questions SIGNIFICANTLY helped you with your learning of programming, please email me with a brief statement of appreciation at my work MQ email address (gaurav.gupta@mq.edu.au) which I may use for teaching grants.
In preferences (https://codingbat.com/pref), under "Teaching Share", put gaurav.gupta@mq.edu.au, so I can use your progress graphs to write further useful questions.
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* IMPORTANT *
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Codingbat (as of now) uses Python 2, so the behaviour, in some cases, will be different from Python 3. For example, division works differently. In Python 2, 12 / 5 = 2, while in Python 3, 12 / 5 = 2.4.
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For MQ students, it is imperative that you attend and/or watch the relevant lectures before attempting these problems, otherwise, it's like trying to back a cake without any recipe.
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Use the feedback from the tests and trace through your code line-by-line to see the cause.
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I suggest splitting one complex statement into several ones to make it easier to debug.
So,
instead of:
alpha = (ch >= 'a' AND ch <= 'z') OR (ch >= 'A' AND ch <= 'Z')
use:
uppercase = (ch >= 'A' AND ch <= 'Z')
lowercase = (ch >= 'a' AND ch <= 'z')
alpha = uppercase OR lowercase
For any questions about these problems, contact me at my email address.
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I advise that you tackle the problem individually, but have a study group that you can go to, if you get stuck.
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MQ Computing students can visit the drop-in centre (https://students.mq.edu.au/study/faculties/science-and-engineering/drop-in-centre) to get help with any of these problems since they are not assessed.
Unfortunately, codingbat doesn't, yet, support classes.
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