\nIn any programming language, I like to discover how to test the existence of a variable. It’s more straightforward in some than others.<\/p>\n
\nPython really shines in this regard, with its great way of handling exceptions. First of all, it’s important to realize that when a variable is mentioned that doesn’t exist, Python gives a NameError exception. In the repl, I entered the following:\n<\/p>\n
\ndel var1 # make sure var1 not defined \nPython’s exception handling mechanism is really convenient: it can steer you around the quicksand of “not defined”, etc\n<\/p>\n Source:<\/p>\n stackoverflow.com<\/a>: paxdiablo’s answer<\/p>\nJack of Oracle Tutoring by Jack and Diane,<\/a> Campbell River, BC.\n","protected":false},"excerpt":{"rendered":" Self-tutoring about Python: the tutor mentions a favourite test of his. In any programming language, I like to discover how to test the existence of a variable. It’s more straightforward in some than others. Python really shines in this regard, …<\/p>\n