[Zope] Changing key in dictionary

Hi, Is there a way to change the key itself of a dictionary. For instance: items={'the first': [], 'the second': []} Now at a certain time I want to change the 'the first' in something else. Is there a 'rename' method? Sorry for being ingorant but I couldn't find in the documentation or on the net. I want to mimic the rename function in Zope. thanks, Henny