Python one-liner to check if at least one item in list exists in another list?

Python one-liner to check if at least one item in list exists in another list?

You can use a one-liner in Python to check if at least one item in one list exists in another list using a set intersection. Here's how you can do it:

list1 = [1, 2, 3, 4, 5] list2 = [3, 6, 7, 8, 9] at_least_one_common = bool(set(list1) & set(list2)) print(at_least_one_common) # True

In this example, we convert both list1 and list2 into sets and then use the & operator to find the intersection of the sets. If there is at least one common element between the two lists, the result will be a non-empty set, which evaluates to True when converted to a boolean. If there are no common elements, the result will be an empty set, which evaluates to False.

Examples

  1. "Python one-liner to check if lists have common elements"

    • Description: This query demonstrates a one-liner to check if two lists share at least one common element using set.intersection.
    • Code:
      list1 = [1, 2, 3] list2 = [3, 4, 5] has_common = bool(set(list1) & set(list2)) print("Has common elements?", has_common) # Output: True

  2. "Python one-liner to check if any item from one list is in another list"

    • Description: This query demonstrates a one-liner to check if any item from one list is in another list using a generator expression.
    • Code:
      list1 = [1, 2, 3] list2 = [5, 6, 7, 8, 2] has_common = any(item in list2 for item in list1) print("Has common elements?", has_common) # Output: True

  3. "Python one-liner to find common items between lists"

    • Description: This query shows a one-liner to find the common elements between two lists using set.intersection.
    • Code:
      list1 = [1, 2, 3] list2 = [3, 4, 5] common_elements = list(set(list1).intersection(list2)) print("Common elements:", common_elements) # Output: [3]

  4. "Python one-liner to check if subset of list exists in another list"

    • Description: This query demonstrates a one-liner to check if all elements from one list are in another list using set.issubset.
    • Code:
      list1 = [1, 2] list2 = [1, 2, 3, 4] is_subset = set(list1).issubset(list2) print("Is list1 a subset of list2?", is_subset) # Output: True

  5. "Python one-liner to check if lists are identical"

    • Description: This query checks if two lists are identical by converting them into sets and using set comparison.
    • Code:
      list1 = [1, 2, 3] list2 = [3, 2, 1] are_identical = set(list1) == set(list2) print("Are lists identical?", are_identical) # Output: True

  6. "Python one-liner to check if lists have no common elements"

    • Description: This query demonstrates a one-liner to check if two lists have no common elements using set.isdisjoint.
    • Code:
      list1 = [1, 2, 3] list2 = [4, 5, 6] no_common_elements = set(list1).isdisjoint(list2) print("No common elements?", no_common_elements) # Output: True

  7. "Python one-liner to count common elements between lists"

    • Description: This query shows a one-liner to count the number of common elements between two lists using len(set(...)).
    • Code:
      list1 = [1, 2, 3, 3] list2 = [3, 4, 5] common_count = len(set(list1).intersection(list2)) print("Number of common elements:", common_count) # Output: 1

  8. "Python one-liner to check if one list is in another list (as a whole)"

    • Description: This query checks if one list exists within another list as a whole using str.join.
    • Code:
      list1 = [1, 2, 3] list2 = [4, 1, 2, 3, 6] exists_as_whole = ' '.join(map(str, list1)) in ' '.join(map(str, list2)) print("List1 exists in List2 as a whole?", exists_as_whole) # Output: True

  9. "Python one-liner to check if lists contain same elements (regardless of order)"

    • Description: This query checks if two lists contain the same elements, regardless of order, using sorted lists.
    • Code:
      list1 = [1, 2, 3] list2 = [3, 2, 1] same_elements = sorted(list1) == sorted(list2) print("Lists contain same elements?", same_elements) # Output: True

  10. "Python one-liner to find unique common elements between lists"

    • Description: This query demonstrates a one-liner to find unique common elements between lists, ensuring no duplicates.
    • Code:
      list1 = [1, 2, 3, 3, 4] list2 = [4, 5, 6, 3, 3] unique_common_elements = list(set(list1).intersection(list2)) print("Unique common elements:", unique_common_elements) # Output: [3, 4]

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