Write a function join which, given two lists, it returns a list in which each element is a list of two elements, one from each of the given lists

Question

How can I reach the following goal??

Write a function join which, given two lists, it returns a list in which each element is a list of two elements, one from each of the given lists. For example:

join( [1,2,3] , [”a”,”b”,”c”] )

returns

[ [1,”a”], [2,”b”], [3,”c”] ]

assume that the given lists both have the same length

@Coldspeed it isn't. He's asking for it to be turned into a list of LISTS. — doratheexplorer0911, Jun 25 '17 at 22:56
If both list have same length you can use `list comprehension` as well `[[list1[index], list2[index]] for index in range(len(list1))]` — niraj, Jun 25 '17 at 23:11

Ajax1234 · Accepted Answer · 2017-06-25T22:53:40.063

1

You can use zip:

def join(a, b):
    return [[i, c] for i, c in zip(a, b)]

print join([1,2,3], ['a','b','c'])

Output:

[[1, 'a'], [2, 'b'], [3, 'c']]

edited Jun 25 '17 at 22:53

answered Jun 25 '17 at 22:48

Ajax1234

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What's with those quotes? You have a syntax error in the function body, too. – vaultah Jun 25 '17 at 22:53
opps, sorry, fixed now. – Ajax1234 Jun 25 '17 at 22:53

doratheexplorer0911 · Answer 2 · 2017-06-25T23:04:19.083

0

Use zip:

def join(list_a, list_b):
    return [list(tup) for tup in zip(list_a, list_b)]



a = [1,2,3]
b = ["a", "b", "c"]
c = join(a, b)
print c #prints [[1, "a"], [2, "b"], [3, "c"]]

edited Jun 25 '17 at 23:04

answered Jun 25 '17 at 22:50

doratheexplorer0911

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What's wrong with the answer please? Let me know it is important. – doratheexplorer0911 Jun 25 '17 at 22:57

Write a function join which, given two lists, it returns a list in which each element is a list of two elements, one from each of the given lists

2 Answers2