How to create a list of values in a dictionary comprehension in Python

Question

Taking a very simple example of looping over a sentence and creating a dictionary which maps {x:y}, where x is a key representing the length of the wor

Answer 1

Sure, you can, using sorted + groupby, but it doesn't look great.

from itertools import groupby
d = dict([(k, list(g)) for k, g in groupby(sorted(mywords.split(), key=len), key=len)])

print(d)
{2: ['be', 'be'],
 3: ['May', 'and'],
 4: ['your', 'your'],
 5: ['short'],
 6: ['coffee', 'strong', 'Monday']}

_{P.S., Here's my answer (using defaultdict that I recommend over this) to the original question.}