Python:从value中获取对应的key

my_dict = {'a': 1, 'b': 2, 'c': 3, 'd': 2}
value = 2
keys = [key for key, val in my_dict.items() if val == value]
print(keys)  # 输出 ['b', 'd']

my_dict = {'a': 1, 'b': 2, 'c': 3, 'd': 2}
value = 2
keys = []
for key, val in my_dict.items():
    if val == value:
        keys.append(key)
print(keys)  # 输出 ['b', 'd']

def get_keys_by_value(dictionary, value):
    keys = []
    for key, val in dictionary.items():
        if val == value:
            keys.append(key)
    return keys

my_dict = {'a': 1, 'b': 2, 'c': 3, 'd': 2}
value = 2
keys = get_keys_by_value(my_dict, value)
print(keys)  # 输出 ['b', 'd']