如何将dict中的值组合成新的key/value对，将None替换为空字符串？

def combine_values(dictionary):
    new_dict = {}
    for key, value in dictionary.items():
        if value is None:
            value = ''
        new_dict[key] = value
    return new_dict

# 测试
dict_example = {'key1': 'value1', 'key2': None, 'key3': 'value3'}
new_dict_example = combine_values(dict_example)
print(new_dict_example)

{'key1': 'value1', 'key2': '', 'key3': 'value3'}