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On this page of the site you can watch the video online Python Tutorial 21 - How to test if a Variable has a Value (is None) with a duration of hours minute second in good quality, which was uploaded by the user Caleb Curry 02 July 2014, share the link with friends and acquaintances, this video has already been watched 9,370 times on youtube and it was liked by 85 viewers. Enjoy your viewing!