[Tutor] merging dictionary values based on key

[ski]

Hello,
I have this issue, which I am unsure on how to solve.

 >>> mylist1 = {'a': 'x123', 'b':'12'}
 >>> mylist2 = {'a': 'x234', 'c': 'a23'}
 >>> for k in mylist2:
...     if k in mylist1:
...             mylist1[k] = [mylist1[k], mylist2[k]]
...     else:
...             mylist1[k] = mylist2[k]
...
 >>> mylist1
{'a': ['x123', 'x234'], 'c': 'a23', 'b': '12'}
 >>>

this merges the two dictionaries, but what should be the method if:

 >>> mylist = [{'a': 'x123', 'b':'12'}, {'a': 'x234', 'b': 'd33', 'c': 
'a23'}, {'a': 'x234', 'c': 'XX123'} .... ]

where mylist has nth number of dictionaries and i want to merge the 
values of the keys that are the same?

Thanks

Norman