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from iteration_utilities import deepflatten

# if you only have one depth nested_list, use this

def flatten(l):

  return [item for sublist in l for item in sublist]

l = [[1,2,3],[3]]

print(flatten(l))

# [1, 2, 3, 3]

# if you don't know how deep the list is nested

l = [[1,2,3],[4,[5],[6,7]],[8,[9,[10]]]]

print(list(deepflatten(l, depth=3)))

# [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]