python - Merge fixed length multiple lists -

how merge fixed length multiple lists single list updated value in particular place. in example below, result [1,33,222,3333,11111].

l1 = [1,    "", 111,    "", 11111] l2 = ["",   22, 222,    2222,   ""] l3 = ["",   33, "", 3333,   ""] l4 = .... l5 = ... .... 

is there inbuilt function this. can using 2 loops there must other smart ways same

you can use zip(l1, l2, l3) , or operator on tuples:

[tup[2] or tup[1] or tup[0] tup in zip(l1, l2, l3)] 

or operator returns first true value. , since want last true value, need apply or operator on tuple elements in reverse.

or can zip lists in reverse, , use or operator in order:

[tup[0] or tup[1] or tup[2] tup in zip(l3, l2, l1)] 

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update:

instead of variable number of list, suggest have list of list instead. in case can result this:

li = [[1,    "", 111,    "", 11111],        ["",   22, 222,    2222,   ""],        ["",   33, "", 3333,   ""], ..... on      ]  print [reduce(lambda a, b: or b, tup) tup in zip(*li[::-1])]