I have a dictionary comprehension that works, however I'm not sure if it is very readable/understandable (since I don't understand it well, but i'm a noob).

Data structures:

dict1 = {'this key 1':['this is a comment','this too','finally this'],
      'this key 2':['this is a comment2','this too2','finally this2'],
      'this key 3':['this is a comment3','this too3','finally this3']}                                                          

list1 = ['BlIb','vILB','vliH']

Desired output:

{'BlIb':{'this key 1':['this is a comment','this too','finally this']},
'vILB':{'this key 2':['this is a comment2','this too2','finally this2']},
'vliH':{'this key 3':['this is a comment3','this too3','finally this3']}}

Dictionary comprehensions:

As I said above, this one works, but I'm not sure how readable it is, or if I completely understand the inner dict comprehension (using 'key' twice)

all_data = {idx:{key:dict1[key]} for idx,key in zip(list1,dict1)}

Would this be the best way to do it? and if so could you explain this part{key:Dict[key]}?

And if not, how would you do it?

I've also tried the below, but just adds all three of the Dict items for each List item

all_data = {idx: {key:value for (key,value) in dict1.items()} for idx in list1}