python: iterating through a dictionary with list values

Question

Given a dictionary of lists, such as

d = {\'1\':[11,12], \'2\':[21,21]}

Which is more pythonic or otherwise preferable:

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Answer 1

Here's the list comprehension approach. Nested...

r = [[i for i in d[x]] for x in d.keys()]
print r

[[11, 12], [21, 21]]