如何编写嵌套字典到csv？

import csv

data = {
    'person1': {'name': 'John', 'age': 30, 'city': 'New York'},
    'person2': {'name': 'Alice', 'age': 25, 'city': 'London'},
    'person3': {'name': 'Bob', 'age': 35, 'city': 'Paris'}
}

fields = ['person', 'name', 'age', 'city']
rows = []
for person, info in data.items():
    row = [person, info['name'], info['age'], info['city']]
    rows.append(row)

filename = 'data.csv'
with open(filename, 'w', newline='') as csvfile:
    writer = csv.writer(csvfile)
    writer.writerow(fields)
    writer.writerows(rows)

import csv

data = {
    'person1': {'name': 'John', 'age': 30, 'city': 'New York'},
    'person2': {'name': 'Alice', 'age': 25, 'city': 'London'},
    'person3': {'name': 'Bob', 'age': 35, 'city': 'Paris'}
}

fields = ['person', 'name', 'age', 'city']
rows = []
for person, info in data.items():
    row = [person, info['name'], info['age'], info['city']]
    rows.append(row)

filename = 'data.csv'
with open(filename, 'w', newline='') as csvfile:
    writer = csv.writer(csvfile)
    writer.writerow(fields)
    writer.writerows(rows)