Dictionary Purchase Exercise help

[The Grugnas]

Hi, first of all I wanted to thank the author of the book which seems to be very active and wrote a really amazing book!
As I am a newbie at python (i only have academic programming knowledge), I am getting trouble into understanding that dictionary exercise.
If i create a dict of a list element (which is a tuple, thus statically allocated and not resizeable) i can't update the previously created dictionary element by appending another block to the already existing dictionary value ( which is a list ).
Or, at least, this is what the exercise asks for, as far as i understand (i am sorry as english isn't my first language).
Can I have some help with that exercise on page 183 section 16.9 with an eventual code solution please?

[Steven Lott]

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A tuple and a list are dramatically different. They are both sequence collections. A list is mutable and can be changed. 

a = {‘key’: [1, 2]}

a[‘key’].append(3)

Does modify the list. Try it. 

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"It May Be A Hack, But It Works"