在python中打印嵌套字典，并将所有内容导出到csv文件中

import csv

# 示例嵌套字典
nested_dict = {
    'A': {'1': 'one', '2': 'two'},
    'B': {'3': 'three', '4': 'four'},
    'C': {'5': 'five', '6': 'six'}
}

# 打印嵌套字典
def print_nested_dict(nested_dict):
    for key, value in nested_dict.items():
        print(f'{key}: {value}')

print_nested_dict(nested_dict)

# 将嵌套字典导出到CSV文件
def export_to_csv(nested_dict, filename):
    with open(filename, 'w', newline='') as csvfile:
        writer = csv.writer(csvfile)
        writer.writerow(['Key', 'Subkey', 'Value'])
        for key, value in nested_dict.items():
            for subkey, subvalue in value.items():
                writer.writerow([key, subkey, subvalue])

export_to_csv(nested_dict, 'output.csv')