以紧凑的方式打印大型嵌套字典的结构，而无需打印所有元素

def print_nested_dict(dictionary, indent=0):
    for key, value in dictionary.items():
        if isinstance(value, dict):
            print('\t' * indent + str(key) + ': {')
            print_nested_dict(value, indent + 1)
            print('\t' * indent + '}')
        else:
            print('\t' * indent + str(key) + ': ' + str(value))

# 示例字典
nested_dict = {
    'key1': 'value1',
    'key2': {
        'nested_key1': 'nested_value1',
        'nested_key2': {
            'nested_nested_key1': 'nested_nested_value1',
            'nested_nested_key2': 'nested_nested_value2'
        }
    },
    'key3': 'value3'
}

# 调用函数打印字典结构
print_nested_dict(nested_dict)

key1: value1
key2: {
    nested_key1: nested_value1
    nested_key2: {
        nested_nested_key1: nested_nested_value1
        nested_nested_key2: nested_nested_value2
    }
}
key3: value3