Composite python dictionary with several values from other dictionaries in an identical key

I'll make a reservation right away – I'm not a programmer, but I'm studying Python for my own specific purposes (processing data obtained from the network), so if my question seems naive and simple – I ask you not to judge.

So, there are three different dictionaries with identical keys. The values are different, but can coincide both within one dictionary and in different dictionaries. For example (I made the values in the form of a list, because I understand that it won't be possible to add values in a different way):

Dict_1 = {'a': [2], 'b': [8], 'c': [6],