On Fri, 9 Sep 2016 04:47 pm, Frank Millman wrote: > Hi all > > This should be easy, but I cannot figure it out. > > Assume you have a tuple of tuples - > > a = ((1, 2), (3, 4)) > > You want to add a new tuple to it, so that it becomes - > > ((1, 2), (3, 4), (5, 6))
a = a + ((5, 6),) You might think that you can just add (5, 6) but that doesn't work: py> a + (5, 6) ((1, 2), (3, 4), 5, 6) The plus operator builds a new tuple containing the contents of each of the two tuples concatenated, so to get the result that you want you need a tuple containing (5, 6) as the one and only item. Because that's a tuple with one item, you need a trailing comma: py> len( ((5, 6),) ) 1 py> a + ((5, 6),) ((1, 2), (3, 4), (5, 6)) -- Steve “Cheer up,” they said, “things could be worse.” So I cheered up, and sure enough, things got worse. -- https://mail.python.org/mailman/listinfo/python-list
