Append to a dict of lists with a dict comprehension

Question

Suppose I have a large list of words. For an example:

>>> with open(\'/usr/share/dict/words\') as f:
...     words=[word for word in f.read().split(\'\\         


        

Answer 1

This is not exactly a dict comprehension, but:

reduce(lambda d, w: d.setdefault(w[0], []).append(w[1]) or d,
       ((w[0].lower(), w) for w in words
        if w[0].lower() in 'aeiou'), {})