Victor Subervi wrote: > On Fri, Dec 25, 2009 at 11:35 AM, Carsten Haese <carsten.ha...@gmail.com > <mailto:carsten.ha...@gmail.com>> wrote: > > Victor Subervi wrote: > > Well I've done that. What happens is the storeColNames registers the > > "Availability" field naturally enough; however, as I stated > before, the > > getlist doesn't fetch anything because there is nothing to fetch! No > > such value is passed! > > Well, what does getlist return when the situation you're describing as > "getlist doesn't fetch anything" occurs? Does is raise an exception? > Does it return 0? Does it return None? Does it return an empty list? An > empty string? An empty tuple? Does it return False? Does it not return > at all and causes the universe to fall into a black hole? > > > It returns nothing. I believe I've stated that three times now.
Bzzzt! Wrong! "Nothing" is not a Python object, and stating it three times doesn't make it any less wrong. The result you're getting is a Python object. It might represent Nothingness to you, but it's not nothing. Try to find out what that object is, so that you can then use a Python if-statement to check whether the return value you're getting is such an object. > > So, what I need to do is figure out a way to log > > the fact that no value is fetched. What I have currently, > unfortunately, > > simply ignores the unfetchable value. As I stated before, I need > to log > > the fact that no such value is obtained. Please...how do I do that?? > > Please be less vague. What part do you have a problem with? Checking > whether "no value is fetched" or "log the fact"? > > > No value is fetched because there is no value to fetch. I want to be > able to log the fact that no value was fetched. How do I do that? Am I > not being clear? Here, let me try again, as I began this thread with my > first post. I thought it was so easy, so clear. If I use getfirst, I can > set a default to log whether getfirst gets anything or not. I cannot do > that with getlist. Is there a work-around? See above. Try to find out what kind of object it does return in the case that's causing you grief, and then devise a Python if-statement to test for that object. Hint: Use type() and repr() to find out what getlist() is returning. -- Carsten Haese http://informixdb.sourceforge.net -- http://mail.python.org/mailman/listinfo/python-list
