On 4 June 2012 12:14, Tehn Yit Chin <tehn.yit.c...@gmail.com> wrote: > The potential for the variable not to exists is when I am using the > optparser module, and I want to check if a particular parameter was passed > in or not. If the parameter was not passed in, then the variable would not > exists. Eg
Optparse will always create the variable, it may contain None. > If I call a python script is expecting a parameter "param1" but I failed to > passed it via the command line, I would do the following check > > (options, args)=parser.parse_args() > if options.param1 != None: > param1 = int(options.param1 ) > else: > param1 = 30 > > By the way, please excuse the way I am coding, I come from a C background. The important part of you code is missing. You should show how you create the parser (with the options etc). The optparse module can provide a default value, did you know this? See the online documentation on [1]. It shows an example of this right at the beginning. Greets Sander [1] http://docs.python.org/library/optparse.html _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
