How to append element from a multi-dimensional array to each element of another multi-dimensional array

Question

I am trying to append elements from a multi-dimensional list into a 2nd multi-dimensional list. Here is the code I wrote -

my_list = [
    [["b", ["a"], "c"], ["d", ["a", "b"], "e"]],
    [["j", ["a", "f"]], ["q"]]
]

ref_list = [[["q", "w", "t"], ["y", "u"]], [["s"], ["p", "k", "l"]]]


for a, b in zip(my_list, ref_list):
    for i, subl in enumerate(a):
        for ii, v in enumerate(subl):
            if isinstance(v, list):
                subl[ii] = b[i] + subl[ii]
                break        
print(my_list)

The output I am getting is -

[
    [["b", ["q", "w", "t", "a"], "c"], ["d", ["y", "u", "a", "b"], "e"]],
    [["j", ["s", "a", "f"]], ["p", "k", "l", "q"]]
]

It adds elements of 2nd list to the beginneing of 1st list. The output I am trying to get is of sort -

[
    [["b", ["q", "a", "w", "a", "t", "a"], "c"], ["d", ["y", "a", "b", "u", "a", "b"], "e"]],
    [["j", ["s", "a", "f"]], ["p", "q", "k", "q", "l", "q"]]
]

I want to add inner_most element of my_list after each element of ref_list instead of just adding it once in the end.

not_speshal · Accepted Answer · 2021-07-28 15:45:47Z

1

Slight change to your code:

for a, b in zip(my_list, ref_list):
    for i, subl in enumerate(a):
        for ii, v in enumerate(subl):
            if isinstance(v, list):
                result = list()
                for element in b[i]:
                    result += [element]+subl[ii]
                subl[ii] = result
                break
        else:
            result = list()
            for element in b[i]:
                result += [element]+a[i]
            a[i] = result

>>> my_list
[[['b', ['q', 'a', 'w', 'a', 't', 'a'], 'c'],
  ['d', ['y', 'a', 'b', 'u', 'a', 'b'], 'e']],
 [['j', ['s', 'a', 'f']], ['p', 'q', 'k', 'q', 'l', 'q']]]

answered Jul 28, 2021 at 15:45

not_speshal

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le123 · Accepted Answer · 2021-07-28 15:59:10Z

1

my_list = [
    [["b", ["a"], "c"], ["d", ["a", "b"], "e"]],
    [["j", ["a", "f"]], ["q"]]
]

ref_list = [[["q", "w", "t"], ["y", "u"]], [["s"], ["p", "k", "l"]]]


for a, b in zip(my_list, ref_list):
    for i, subl in enumerate(a):
        for ii, v in enumerate(subl):
            if isinstance(v, list):
                new_subl=subl[ii]
                subl[ii]=[]
                for j in b[i]:
                    subl[ii] +=[j] + new_subl
                break

edited Jul 28, 2021 at 15:59

answered Jul 28, 2021 at 15:47

le123

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3 Comments

not_speshal Over a year ago

This doesn't give the output OP needs. You're missing an else block. mylist[-1] is [['j', ['s', 'a', 'f']], ['q']] instead of [['j', ['s', 'a', 'f']], ['p', 'q', 'k', 'q', 'l', 'q']]

le123 Over a year ago

but he wants to add to the inner_most element. to the 3rd element

not_speshal Over a year ago

See the expected output. Your answer does not give that.

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