Reference library

Dictionaries & sets

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

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How to Find the Intersection of Permission Sets in Python

This code defines a function that takes a list of permission sets and returns a set containing only the permissions common to all sets, with a short-circuit for empty results.

sets intersection permissions
Python 
from typing import Set

def intersect_permissions(permission_sets: list[Set[str]]) -> Set[str]:
    """
    Given a list of permission sets, return the common permissions
    present in every set.
    """
    if not permission_sets:
        return set()
    
    common = permission_sets[0]
    for perm_set in permissi…
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