求从几个集合中各选取一个元素，并组合的算法

# A Recursion function 递归函数

def RecursionFunc(arr1,arrList):
if (arrList):
string = []
for x in arr1:
for y in arrList[0]:
string.append(x + y)
result = RecursionFunc(string,arrList[1:])
return result
else:
return arr1

line_List = [['aa','bb','cc'],['dd','ee','ff'],['gg','hh']]

caseslist = RecursionFunc(line_List[0], line_List[1:])

#每条case
for ele in caseslist:
print(ele)
print('***************************************\n')