Element wise concatenate multiple lists (list of list of strings)

Question

i have a list of list of strings as below

lst = [[\'a\',\'b\',\'c\'],[\'@\',\'$\',\'#\'],[\'1\',\'2\',\'3\']]

I want to concatenate each

Answer 1

Here's one way zipping the sublists and mapping with ''.join the resulting tuples:

list(map(''.join, zip(*lst)))
# ['a@1', 'b$2', 'c#3']

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Here zip as shown in the docs aggregates elements from several iterables. With *, we are unpacking the list into separate iterables, which means that the function will instead be receiving zip(['a','b','c'],['@','$','#'],['1','2','3']).

Now at each iteration, map will be applying ''.join to each of the aggregated iterables, i.e to the first element in each sublist, then the second, and so on.