How to Find the Intersection of Multiple Lists within a List in Python?

Finding the Intersection of Multiple Lists in Python

In Python, determining the intersection of two lists is straightforward using the set.intersection() method. However, the question arises: how do we find the intersection of multiple lists within a list?

Consider the scenario where we have a list of lists, aptly named d, containing three elements a, b, and c, as shown below:

<code class="python">d = [[1, 2, 3, 4], [2, 3, 4], [3, 4, 5, 6, 7]]</code>

To determine the intersection of all three lists, we can leverage Python's set.intersection() method and the map() function. The map() function takes two arguments: a function and an iterable. In this case, we apply the map() function with the set() function to convert each list element in d into a set. The resulting output is a list of sets.

Finally, we utilize the set.intersection() method to compute the intersection of these sets, effectively finding the intersection of all three lists within d.

<code class="python">intersection = set.intersection(*map(set, d))</code>

By executing this code, we obtain the desired intersection:

<code class="python">print(intersection)  # Output: {3, 4}</code>

Therefore, even when dealing with multiple lists within a list, Python provides a concise solution for determining their intersection using the set.intersection() method in conjunction with the map() function.

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