[Python] combining two dictionaries and still have the references to original objects in python

I have two dictionaries and I want to combine the contents of both in order to process them in a combined way. I do the following

a = {'one': 'fileone', 'two': 'filetow'}
b = {'three': 'filethree', 'four': 'filefour'}
clist = a.values() + b.values()

If I change anything in the clist, the change is not reflected in list a or b.


One thing I understand is that the string is immutable type.

I would still want to be able to refer to the old strings and changes to them must reflect in the original string.

Thanks

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