Python 3:如果包含特定字符串，如何搜索和检索构成字典的所有列表

def search_dict(dictionary, search_string):
    result_dict = {}
    for key, value in dictionary.items():
        filtered_list = [item for item in value if search_string in item]
        if filtered_list:
            result_dict[key] = filtered_list
    return result_dict

my_dict = {
    "key1": ["apple", "banana", "cherry"],
    "key2": ["orange", "grape", "kiwi"],
    "key3": ["melon", "strawberry", "blueberry"]
}

search_string = "berry"
result = search_dict(my_dict, search_string)
print(result)

{'key3': ['strawberry', 'blueberry']}