namedtuple

Python 的数据类型

Jason Myers

Instructor

什么是 namedtuple？

一个为每个位置（列）命名的元组
确保每个都有相同的属性
可替代 pandas DataFrame 的一行

创建 namedtuple

传入名称和字段列表

from collections import namedtuple

Eatery = namedtuple('Eatery', ['name', 'location', 'park_id',
   ...: 'type_name'])

eateries = []

for eatery in nyc_eateries:
    details = Eatery(eatery['name'],
                     eatery['location'],
                     eatery['park_id'],
                     eatery['type_name'])
    eateries.append(details)

打印第一个元素

print(eateries[0])

Eatery(name='Mapes Avenue Ballfields Mobile Food Truck',
location='Prospect Avenue, E. 181st Street',
park_id='X289', type_name='Mobile Food Truck')

利用 namedtuple

每个字段可作为 namedtuple 的属性访问

for eatery in eateries[:3]:
    print(eatery.name)
    print(eatery.park_id)
    print(eatery.location)

Mapes Avenue Ballfields Mobile Food Truck
X289
Prospect Avenue, E. 181st Street

Claremont Park Mobile Food Truck
X008
East 172 Street between Teller & Morris avenues ...

Passons à la pratique !

Python 的数据类型