Python Program to Find Intersection of Two Lists

To find the intersection of two lists in Python, you can use various methods, including list comprehensions, built-in functions, or sets. Here are a few examples:

Using List Comprehension:

You can use list comprehensions to create a new list containing elements that are common to both input lists:

list1 = [1, 2, 3, 4, 5]
list2 = [3, 4, 5, 6, 7]

intersection = [value for value in list1 if value in list2]

print(intersection)

This code will output [3, 4, 5], which is the intersection of list1 and list2.

Using the set Data Type:

You can convert the lists to sets and then use the intersection() method to find their intersection:

list1 = [1, 2, 3, 4, 5]
list2 = [3, 4, 5, 6, 7]

set1 = set(list1)
set2 = set(list2)

intersection = list(set1.intersection(set2))

print(intersection)

This code produces the same output: [3, 4, 5].

Using filter() and lambda:

You can use the filter() function along with a lambda function to find the intersection:

list1 = [1, 2, 3, 4, 5]
list2 = [3, 4, 5, 6, 7]

intersection = list(filter(lambda x: x in list1, list2))

print(intersection)

Again, this code yields [3, 4, 5].

Choose the method that best suits your needs and coding style. The first method using list comprehension is concise and readable, making it a popular choice for finding the intersection of two lists.