complete change of the lesson to cover exceptions and try except pattern. Closes #1084
If this pull request addresses an open issue on the repository, please add 'Closes #NN' below, where NN is the issue number.
Please briefly summarise the changes made in the pull request, and the reason(s) for making these changes.
Changes completely the lesson to cover input validation using exception and try except patterns. It addresses #1084 adn #979
If any relevant discussions have taken place elsewhere, please provide links to these.
979 #622, #773 and #874,
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complete change of the lesson to cover exceptions and try except pattern. Closes #1084
If this pull request addresses an open issue on the repository, please add 'Closes #NN' below, where NN is the issue number.
Please briefly summarise the changes made in the pull request, and the reason(s) for making these changes.
Changes completely the lesson to cover input validation using exception and try except patterns. It addresses #1084 adn #979
If any relevant discussions have taken place elsewhere, please provide links to these.
979 #622, #773 and #874,