List of dicts to/from dict of lists

Perhaps consider using numpy:

import numpy as np

arr = np.array([(0, 2), (1, 3)], dtype=[('a', int), ('b', int)])
print(arr)
# [(0, 2) (1, 3)]

Here we access columns indexed by names, e.g. 'a', or 'b' (sort of like DL):

print(arr['a'])
# [0 1]

Here we access rows by integer index (sort of like LD):

print(arr[0])
# (0, 2)

Each value in the row can be accessed by column name (sort of like LD):

print(arr[0]['b'])
# 2

For those of you that enjoy clever/hacky one-liners.

Here is DL to LD:

v = [dict(zip(DL,t)) for t in zip(*DL.values())]
print(v)

and LD to DL:

v = {k: [dic[k] for dic in LD] for k in LD[0]}
print(v)

LD to DL is a little hackier since you are assuming that the keys are the same in each dict. Also, please note that I do not condone the use of such code in any kind of real system.