TYPES:
d = dict
l = list
s = string
i = int
b = binary (True/False)
o = object

- pkey's dict key is the 40-char key ID of the primary key
- "==>" indicates the next item is a dict and the current item may contain one or more elements of the same format,
  "++>" is a list,
  "-->" is a "flat" item (string, object, int, etc.)
-"status" is one of "an UPGRADE", "a DOWNGRADE", or "a NEW TRUST".

keys(d)	==>	(40-char key ID)(s)	==>	pkey(d)		-->	email(s)
								-->	name(s)
								-->	creation (o, datetime)
								-->	key(o, gpg)
					-->	trust(i)
					-->	check(i)
					-->	local(b)
					-->	notify(b)
					==>	subkeys(d)	==>	(40-char key ID)(s)	-->	creation
					-->	change(b)
					-->	sign(b)
					-->	status(s)
					==>	uids(d)		==>	email(s)		-->	name(s)
												-->	comment(s)
												-->	email(s)
												-->	updated(o, datetime)*

* For many keys, this is unset. In-code, this is represented by having a timestamp of 0, or a
  datetime object matching UNIX epoch. This is converted to a string, "Never/unknown".

for email templates, they are looped over for each key dict as "key".
so for example, instead of specifying "keys['748231EBCBD808A14F5E85D28C004C2F93481F6B']['pkey']['name']",
you instead should specify "key['pkey']['name']". To get the name of e.g. the second uid,
you'd use "key['uids'][(uid email)]['name'].

e.g. in the code, it's this:
{'748231EBCBD808A14F5E85D28C004C2F93481F6B': {'change': None,
                                              'check': 0,
                                              'local': False,
                                              'notify': True,
                                              'pkey': {'creation': '2013-12-10 '
                                                                   '08:35:52',
                                                       'email': 'brent.saner@gmail.com',
                                                       'key': '<GPGME object>',
                                                       'name': 'Brent Timothy '
                                                               'Saner'},
                                              'sign': True,
                                              'status': None,
                                              'subkeys': {'748231EBCBD808A14F5E85D28C004C2F93481F6B': '2013-12-10 '
                                                                                                      '08:35:52'},
                                              'trust': 2,
                                              'uids': {'brent.saner@gmail.com': {'comment': '',
                                                                                 'name': 'Brent '
                                                                                         'Timothy '
                                                                                         'Saner',
                                                                                 'updated': 'Never/unknown'},
                                                       'bts@square-r00t.net': {'comment': 'http://www.square-r00t.net',
                                                                               'name': 'Brent '
                                                                                       'S.',
                                                                               'updated': 'Never/unknown'},
                                                       'r00t@sysadministrivia.com': {'comment': 'https://sysadministrivia.com',
                                                                                     'name': 'r00t^2',
                                                                                     'updated': 'Never/unknown'},
                                                       'squarer00t@keybase.io': {'comment': '',
                                                                                 'name': 'keybase.io/squarer00t',
                                                                                 'updated': 'Never/unknown'}}}}
but this is passed to the email template as:
{'change': None,
 'check': 0,
 'local': False,
 'notify': True,
 'pkey': {'creation': '2013-12-10 08:35:52',
          'email': 'brent.saner@gmail.com',
          'key': '<GPGME object>',
          'name': 'Brent Timothy Saner'},
 'sign': True,
 'status': None,
 'subkeys': {'748231EBCBD808A14F5E85D28C004C2F93481F6B': '2013-12-10 08:35:52'},
 'trust': 2,
 'uids': {'brent.saner@gmail.com': {'comment': '',
                                    'name': 'Brent Timothy Saner',
                                    'updated': '1970-01-01 00:00:00'},
          'bts@square-r00t.net': {'comment': 'http://www.square-r00t.net',
                                  'name': 'Brent S.',
                                  'updated': 'Never/unknown'},
          'r00t@sysadministrivia.com': {'comment': 'https://sysadministrivia.com',
                                        'name': 'r00t^2',
                                        'updated': 'Never/unknown'},
          'squarer00t@keybase.io': {'comment': '',
                                    'name': 'keybase.io/squarer00t',
                                    'updated': 'Never/unknown'}}}

(because the emails are iterated through the keys).


the same structure is available via the "mykey" dictionary (e.g. to get the key ID of *your* key,
you can use "mykey['subkeys'][0][0]"):

{'change': False,
 'check': None,
 'local': False,
 'notify': False,
 'pkey': {'creation': '2017-09-07 20:54:31',
          'email': 'test@test.com',
          'key': '<GPGME object>',
          'name': 'test user'},
 'sign': False,
 'status': None,
 'subkeys': {'1CD9200637EC587D1F8EB94198748C2879CCE88D': '2017-09-07 20:54:31',
             '2805EC3D90E2229795AFB73FF85BC40E6E17F339': '2017-09-07 20:54:31'},
 'trust': 'ultimate',
 'uids': {'test@test.com': {'comment': 'this is a testing junk key. DO NOT '
                                       'IMPORT/SIGN/TRUST.',
                            'name': 'test user',
                            'updated': 'Never/unknown'}}}


you also have the following variables/lists/etc. available for templates (via the Jinja2 templating syntax[0]):
- "keyservers", a list of keyservers set.



[0] http://jinja.pocoo.org/docs/2.9/templates/