# Some helper class for example1

from enum import Enum


# Derive from str to make json encoding easy.
class Region(str, Enum):
    EU: str = 'EU'
    NA: str = 'NA'
    AS: str = 'AS'
    UNKNOWN: str = 'UNKNOWN'


def region(dc: str):
    dc2region = {
        'fra': Region.EU,
        'zrh': Region.EU,
        'krk': Region.EU,
        'nyc': Region.NA,
        'tok': Region.AS,
    }
    return dc2region.get(dc, Region.UNKNOWN)