Timezone Dict Merge

gistfile1.py

#!/usr/bin/python

timezones_account_one= {
        'United States of America': {
            'Alaska': {
                'America/Adak': 'Adak, Alaska, USA',
                'America/Anchorage': 'Anchorage, Alaska, USA',
            },
            'Idaho': {
                'America/Los_Angeles': 'Coeur\'d Alene, Idaho, USA',
            },
            'Hawaii': {
                'Pacific/Honolulu': 'Kapolei, Hawaii, USA',
                'Pacific/Honolulu': 'Kona, Hawaii, USA',
            },
        },
        'Misc': {
            'UTC': {
                'UTC': 'UTC',
            },
        },
    }

timezones_account_two = {
        'United States of America': {
            'Alaska': {
                'America/Anchorage': 'Anchorage, Alaska, USA',
            },
        },
        'Asia': {
            'Phillipines': {
                'Asia/Manila': 'Manila, Metro Manila, Phillipines',
            },
        },
        'Misc': {
            'UTC': {
                'UTC': 'UTC',
            },
        },
    }

timezones_personal = {
        'United States of America': {
            'Alaska': {
                'America/Anchorage': 'Anchorage, Alaska, USA',
            },
        },
        'Misc': {
            'UTC': {
                'UTC': 'UTC',
            },
        },
    }


timezonedicts = (timezones_account_one, timezones_account_two, timezones_personal)

zone1set = set()
zone1set.update(*[x.keys() for x in timezonedicts])

zone2set = set()

for zone1 in zone1set:
    zone2set.update(*[x.get(zone1, {}).keys() for x in timezonedicts])

timezones = {}

for zone1 in zone1set:
    timezones.setdefault(zone1, {})
    for zone2 in zone2set:
        zone3set = [y for y in [x.get(zone1, {}).get(zone2, {}).items() for x in timezonedicts] if y]
        if zone3set:
            timezones[zone1].setdefault(zone2, set())
            timezones[zone1][zone2].update(*zone3set)

import pprint
pprint.pprint(timezones, width=1, indent=2)

## RESULTS IN

{ 'Asia': { 'Phillipines': set([ ( 'Asia/Manila',
                                   'Manila, Metro Manila, Phillipines')])},
  'Misc': { 'UTC': set([ ( 'UTC',
                           'UTC')])},
  'United States of America': { 'Alaska': set([ ( 'America/Adak',
                                                  'Adak, Alaska, USA'),
                                                ( 'America/Anchorage',
                                                  'Anchorage, Alaska, USA')]),
                                'Hawaii': set([ ( 'Pacific/Honolulu',
                                                  'Kona, Hawaii, USA')]),
                                'Idaho': set([ ( 'America/Los_Angeles',
                                                 "Coeur'd Alene, Idaho, USA")])}}