Reference library

Dictionaries & sets

Key–value maps, uniqueness, counting, grouping, and fast lookups.

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Dictionaries & sets easy

How to Find Symmetric Difference Between Two Python Sets

Compute elements unique to each set and build a flag dictionary showing membership across two Python sets.

sets set-operations symmetric-difference
Python 
def symmetric_difference_with_flags(set_a, set_b):
    """Return elements in either set but not both, grouped by which set they came from."""
    only_in_a = set_a - set_b
    only_in_b = set_b - set_a
    
    print(f"Only in A: {only_in_a}")
    print(f"Only in B: {only_in_b}")
    print(f"Symmetric difference: {onl…
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