Fun Fact of the Day

So, let's say you're trying to catalog an object in a ZCatalog, and for important reasons irrelevant to the instant case you have code similar to the following:

    from Products.CMFCore.utils import getToolByName

    def _getCatalog():
        try:
            return getToolByName(context, 'my_catalog')
        except AttributeError:
            return None

    catalog = _getCatalog()
    if catalog:
        catalog.catalog_object(myobject)

I sure assumed that would work. Not so! If the catalog is empty, bool(catalog)==False. You have to do:

    if catalog is not None:

And there's an hour I'll never get back.