How do I print the index from two different lists? i.e., [1, 2, 3] and [a, b, c] becomes [(1, a), (2, b), (3, c)]

Question

You are given two lists of the same length. Using list comprehension, write a Python function to return a merged or combined list of the two lists in the form of a list of tuples. For example, if your two lists are [1, 2, 3] and ["a", "b", "c"], then you should return [(1, "a"), (2, "b"), (3, "c")].

I can't figure out how to index the two lists to put them together

I got multiple errors because I couldn't concatenate two lists together.

You should avoid posting questions like these, which seem like an exercise you've been given and you have not put any effort in resolving — yatu, Jul 08 '19 at 17:21

score 4 · Answer 1 · answered Jul 08 '19 at 17:21

4

The zip() function take iterables (can be zero or more), makes iterator that aggregates elements based on the iterables passed, and returns an iterator of tuples.

 [ (a,b) for (a,b) in zip([1,2,3],['a','b','c']) ]

answered Jul 08 '19 at 17:21

Asnim P Ansari

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`[x for x in something]` -> `list(something)` – juanpa.arrivillaga Jul 08 '19 at 17:25
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Also if the first sequence is a count (1,2,3, ...) you can do ```enumerate(['a', 'b', 'c'], 1)``` or ```zip(itertools.count(1), ['a', 'b', 'c'])``` – Victor Ruiz Jul 08 '19 at 17:26
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Or, even easier, `list(zip([1, 2, 3], ['a', 'b', 'c']))`. – Rory Daulton Jul 08 '19 at 17:51
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Or even better: ```list(zip([1,2,3], 'abc'))``` – Victor Ruiz Jul 08 '19 at 17:56
All of these answers make sense, but it is mentioned that he needs list comprehension. – Asnim P Ansari Jul 08 '19 at 18:31

How do I print the index from two different lists? i.e., [1, 2, 3] and [a, b, c] becomes [(1, a), (2, b), (3, c)]

1 Answers1