'''
attrgetter 简单用法
'''
from collections import namedtuple
LatLong = namedtuple('LatLong', ['lat', 'long'])
Metropolis = namedtuple('Metropolis', ['name', 'cc', 'pop', 'coord'])

metro_data = [
    ('Tokyo', 'JP', 36.933, (35.689722, 139.691667)),
    ('Delhi NCR', 'IN', 21.935, (28.613889, 77.208889)),
    ('Mexico City', 'MX', 20.142, (19.433333, -99.133333)),
    ('New York-Newark', 'US', 20.104, (40.808611, -74.020386)),
    ('Sao Paulo', 'BR', 19.649, (-23.547778, -46.635833)),
]

metro_areas = [
    Metropolis(name, cc, pop, LatLong(lat, long))
    for name, cc, pop, (lat, long) in metro_data
]

print(metro_areas[0])
print(metro_areas[0].coord.lat)
print('----' * 10)
from operator import attrgetter
name_lat = attrgetter('name', 'coord.lat')
print(name_lat(metro_areas[0]))