[Tutor] Dict of Dict with lists

[Kai Bojens]

Hello everybody,
I'm coming from a Perl background and try to parse some Exim Logfiles into a
data structure of dictionaries. The regex and geoip part works fine and I'd
like to save the email adress, the countries (from logins) and the count of
logins.

The structure I'd like to have:

result = {
        'foo at bar.de': {
            'Countries': [DE,DK,UK]
            'IP': ['192.168.1.1','172.10.10.10']
            'Count': [12]
            }
        'bar at foo.de': {
            'Countries': [DE,SE,US]
            'IP': ['192.168.1.2','172.10.10.11']
            'Count': [23]
            }
        }

I don't have a problem when I do these three seperately like this with a one
dimensonial dict (snippet):

result = defaultdict(list)

with open('/var/log/exim4/mainlog',encoding="latin-1") as logfile:
    for line in logfile:
        result = pattern.search(line)
        if (result):
            login_ip = result.group("login_ip")
            login_auth =  result.group("login_auth")
            response = reader.city(login_ip)
            login_country = response.country.iso_code
            if login_auth in result and login_country in result[login_auth]:
                continue
            else:
                result[login_auth].append(login_country)
        else:
            continue

This checks if the login_country exists within the list of the specific
login_auth key, adds them if they don't exist and gives me the results I want.
This also works for the ip addresses and the number of logins without any problems. 

As I don't want to repeat these loops three times with three different data
structures I'd like to do this in one step. There are two main problems I
don't understand right now:

1. How do I check if a value exists within a list which is the value of a key 
which is again a value of a key in my understanding exists? What I like to do:

 if login_auth in result and (login_country in result[login_auth][Countries])
  continue

This obviously does not work and I am not quite sure how to address the values
of 'Countries' in the right way. I'd like to check 'Key1:Key2:List' and don't
know how to address this

2. How do I append new values to these lists within the nested dict?