在集合字典中对具有相同值的所有键进行分组

def group_keys_by_value(dictionary):
    result = {}
    for key, value in dictionary.items():
        if value not in result:
            result[value] = [key]
        else:
            result[value].append(key)
    return result

my_dict = {'a': 1, 'b': 2, 'c': 1, 'd': 2, 'e': 3}

{1: ['a', 'c'], 2: ['b', 'd'], 3: ['e']}