Python 3:扁平化字典中的嵌套字典和列表

def flatten_dict(dictionary, parent_key='', sep='_'):
    items = []
    for k, v in dictionary.items():
        new_key = parent_key + sep + k if parent_key else k
        if isinstance(v, dict):
            items.extend(flatten_dict(v, new_key, sep=sep).items())
        elif isinstance(v, list):
            for i, item in enumerate(v):
                new_key = new_key + sep + str(i)
                if isinstance(item, dict):
                    items.extend(flatten_dict(item, new_key, sep=sep).items())
                else:
                    items.append((new_key, item))
        else:
            items.append((new_key, v))
    return dict(items)

nested_dict = {
    'key1': 'value1',
    'key2': {
        'nested_key1': 'nested_value1',
        'nested_key2': {
            'nested_nested_key1': 'nested_nested_value1'
        }
    },
    'key3': [
        {'list_key1': 'list_value1'},
        {'list_key2': 'list_value2'}
    ]
}

flattened_dict = flatten_dict(nested_dict)
print(flattened_dict)

{
    'key1': 'value1',
    'key2_nested_key1': 'nested_value1',
    'key2_nested_key2_nested_nested_key1': 'nested_nested_value1',
    'key3_0_list_key1': 'list_value1',
    'key3_1_list_key2': 'list_value2'
}