namedtuple

Python のデータ型

Jason Myers

Instructor

namedtupleとは？

各位置（列）に名前を持つタプル
各要素が同じプロパティを持つことを保証
pandas DataFrameの行の代替

namedtupleの作成

名前とフィールドのリストを渡す

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)

最初の要素を出力

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')

namedtupleの活用

各フィールドはnamedtupleの属性としてアクセス可能

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 ...

練習しましょう！

Python のデータ型