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Python - lists intersection, difference, union and symmetric difference practical examples
3 points
In this article, we would like to show you how to implement instersection, difference, union and symmetric difference functions for lists in Python.
Practical example:
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def difference(input_list1, input_list2):2
return list(set(input_list1) - set(input_list2))3
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def symmetric_difference(input_list1, input_list2):6
return list(set(input_list1) ^ set(input_list2))7
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def intersection(input_list1, input_list2):10
return [item for item in input_list1 if item in input_list2]11
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def union(input_list1, input_list2):14
return list(set(input_list1) | set(input_list2))15
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# Usage example:18
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list1 = [1, 2, 3, 4]20
list2 = [1, 2, 5, 6]21
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# Warning: the order matters!23
print(difference(list1, list2)) # [3, 4]24
print(difference(list2, list1)) # [5, 6]25
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print(symmetric_difference(list1, list2)) # [3, 4, 5, 6]27
print(intersection(list1, list2)) # [1, 2]28
print(union(list2, list1)) # [1, 2, 3, 4, 5, 6]