[Tutor] how can I use Set.interaction function on a dictionary

[Danny Yoo]

> 1. I have a dictionary with 4 keys and some repeated
> values for each key.
>
>>>> dida
> {'NM_001033044': [32842023, 32842023, 32842023,
> 32842023, 32842023, 32842023, 32842023, 32842023,
> 32842023, 32842023, 32842023, 32842023, 32843894,
> 32843894, 32843894, 32843894, 32843894, 32843894,
> 32843894, 32843894, 32843894, 32843894, 32844846,
> 32844846, 32844846, 32844846, 32844846, 32844846,
> 32844846, 32844846, 32844846, 32844846, 32845745],

[cut]


> 1. How can I get A^B^C^D(^ = intersection) where A, B, C and D are keys 
> from dida or didi.

What would be a few concrete examples of this operation?  What would be a 
concrete instance of this problem, and the expected result?

That is, let's call this operation "intersection()" for the moment, and 
just pretend that it exists.  Can you construct a simple, sample call to 
this imaginary "intersection()" function?  What expected value do we get 
back?

Wishful thinking through examples is a good technique when one is not 
quite sure how to do something yet.  (Plus it will be less ambiguous than 
English --- I have to admit that I do not understand the problem statement 
yet.)


Also, simplify the problem a little more: doing an operation on four 
elements at once seems a bit arbitrary.  Rather than four, let's bring the 
problem's complexity down a bit.  If you had a function to do it on two 
items:

     A ^ B

where A and B are either from dida or didi, would this be easier for you 
to consider?  Would you be able to do this smaller problem?  I'd recommend 
tackling this first before going all out on the bigger problem.