How to map and append values from one list to other list python 3?
in_put_1 = [["a alphanum2 c d"], ["g h"]]
in_put_2 = [["e f"], [" i j k"]]
output = ["a alphanum2 c d e f", "g h i j k"]
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is the output a flat list? the output must be sorted? by individual element? – Adam.Er8 Jun 13 '19 at 11:53
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Possible duplicate of [Get difference between two lists](https://stackoverflow.com/questions/3462143/get-difference-between-two-lists) – Amine Messaoudi Jun 13 '19 at 11:54
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@AmineMessaoudi this isn't asking for diff, it's merging them – shriakhilc Jun 13 '19 at 11:54
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it should be merged and no sorting – suba Jun 13 '19 at 11:56
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why do you need array of single string? is it comma separated? – Kousik Jun 13 '19 at 11:58
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no comma separated – suba Jun 13 '19 at 11:59
4 Answers
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You can concatenate the strings in the sublists together while iterating over the two lists together using zip, stripping the individual strings to get rid of surrounding whitespaces in the process
[f'{x[0].strip()} {y[0].strip()}' for x, y in zip(in_put_1, in_put_2)]
To do it without zip, we would need to explicitly use indexes to access elements in the list
result = []
for idx in range(len(in_put_1)):
s = f'{in_put_1[idx][0].strip()} {in_put_2[idx][0].strip()}'
result.append(s)
The output will be
['a alphanum2 c d e f', 'g h i j k']
Devesh Kumar Singh
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>>>map(lambda x,y: x[0]+" "+y[0],in_put_1,in_put_2)
['a alphanum2 c d e f', 'g h i j k']
Kousik
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2N.B. In Python 3, `map` returns a generator and needs to be converted to list first before obtaining the output in the form of a list. – TrebledJ Jun 13 '19 at 12:08
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[' '.join(element1+element2) for (element1,element2) in zip(in_put_1,in_put_2) ]
sahasrara62
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horseshoe
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a = [["a alphanum2 c d"], ["g h"]]
b = [["e f"], [" i j k"]]
c = []
for (a1, b1) in zip(a,b):
c.append(''.join([str(a) + b for a,b in zip(a1,b1)]))
print(c)
Maxx Selva K
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