从Python中的多个列表生成值的完整组合？

Question

我想从多个列表中生成值组合的全矩阵。 但是我并不总是知道会提供多少个列表，每个列表的长度可以不同。 我可以通过滥用itertools.product（）来获得答案，但是我认为这太过分了。 还有更Python化的方式吗？

import itertools

listoflists = [
   ["happy","sad"],
   ["car","bike","truck"],
   ["true","false"],
   [3,6,34,8,31]]

def comboGenerator(lol):

  # create a uniform N-dimensional struct, big enough to hold longest dimension
  longest = max(map(lambda x: len(x),lol))
  superstruct = itertools.product(range(longest), repeat=len(lol))

  # visit each cell in the struct, ignore the empty ones
  for a in superstruct:
    combo = []
    try:
      for index in range(len(lol)):
        combo.append(lol[index][a[index]])
      yield (combo)
    except IndexError:  #this was an empty cell; try again
      pass

for x in comboGenerator(listoflists):
  print (x)

Answer 1

result = list(itertools.product(*listoflists))

如果希望result列表的元素类型为list ，则通过以下方式将其转换：

result = [list(item) for item in result]