Thanks Tino, if notes is None: notes = 'none' else: notes=notes[0:35] return notes Using None worked. There are still some keywords and functions in python that I am still learning. Thanks Again, Laura -----Original Message----- From: Tino Wildenhain [mailto:tino@wildenhain.de] Sent: Friday, October 15, 2004 1:44 PM To: Laura McCord Cc: zope@zope.org Subject: Re: [Zope] python script and dealing with NULL parameter Hi, Am Fr, den 15.10.2004 schrieb Laura McCord um 20:24:
I noticed that when the parameter is Null I get a Type Error Unsubscriptable object. Is there a python function or an if statement that will fix this?
There is no "null" in Python. The equivalence to that (and I suspect you are talking about this) is None. Usually database adaptors map SQL "null" to Python None. In python you have: is None ==None to check. In most situations, boolean algebra is more convient: None, "", '', {}, (), [] and so on are logically "false". if maybe_none: will only used if true or not one of the above values also: maybe_none or "defaultvalue" is usefull if you like functional programming (list comprehensions for example) (value is None and "No pricetag") or ("$ %0.2f" % value) would be an expression for full functional programming using boolean algebra :-) (try it out with different values from python command line) Regards Tino