Python add item to the tuple

I have some object.ID-s which I try to store in the user session as tuple. When I add first one it works but tuple looks like (u'2',) but when I try to add new one using mytuple = mytuple + got error can only concatenate tuple (not "unicode") to tuple.

You need to make the second element a 1-tuple, eg:

    a = ('2',)
    b = 'z'
    new = a + (b,)