[János Juhász] | I can't find the defined() function in python, so I used | | 'variable name' in dir() | | for check if the variable defined. | | >>> name = 'Joe' | >>> if 'name' in dir(): | ... print name | ...
I'm not entirely sure where you'd want to use this, but probably the most Pythonic way of doing this would be: <code> name = "Joe" try: name except NameError: print "name not defined" else: print "name defined" </code> I suspect that your idea of variable definition doesn't quite match Python's concept. In short, it's impossible to "declare" a variable in Python without binding it to *something*. ie a variable is always a binding to an object, not a hole waiting to be filled. You could, if you wanted, initialise name to None (or some other sentinel value) and then check against that, either explicitly: if name is None: print "name unitialised" or by taking advantage of the fact that several empty objects in Python are considered False: if not Name: print "name unitialised" Hope that helps more than it confuses. TJG ________________________________________________________________________ This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________ _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
