How can I Interleave Lists in Python using Zip and List Comprehension?

Utilizing Zip and List Comprehension for Interleaving Lists

Interleaving lists of equal length in Python is a common task. Given two lists [1,2,3] and [10,20,30], the goal is to transform them into [1,10,2,20,3,30].

Solution Using Zip and List Comprehension:

A concise approach to interleaving lists is to utilize the zip function and list comprehension. The following code accomplishes the task:

[val for pair in zip(l1, l2) for val in pair]

In this code:

• zip(l1, l2) iterates over pairs of elements from the two input lists.
• The outer list comprehension ([val for pair in zip(l1, l2)]) creates a new list for each pair.
• The inner list comprehension ([val for val in pair]) creates a new list for each pair of values.

Extension for Interleaving Multiple Lists:

If there are multiple lists to interleave (N lists), the same concept can be extended using the * operator within zip:

lists = [l1, l2, ...]
[val for tup in zip(*lists) for val in tup]

In this code:

• zip(*lists) iterates over tuples of corresponding elements from all input lists.
• The outer list comprehension ([val for tup in zip(*lists)]) creates a new list for each tuple.
• The inner list comprehension ([val for val in tup]) creates a new list for each tuple of values.

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