Fredrik Lundh wrote: > km wrote: > > >>Is there any handy untility for checking if a variable is populated at >>runtime ? > > > access it, and catch the NameError: > > try: > variable > except NameError:
In a function when accessing a not-yet-bound local variable you may also (as Fredrik knows but didn't bother to say) see an UnboundLocalError exception, > print "not defined" > else: > print "defined" > > leaving variables undefined is usually bad style, though; if you can, > assign some value to it, and test for that value instead: > > variable = None > > ... lots of code that may assign to variable ... > > if variable is not None: > print "not defined" > regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden -- http://mail.python.org/mailman/listinfo/python-list
