For Python3, I believe that using the Pytz built-in module will be easier

>> import pytz
>> print(pytz.country_names['tn'])
Tunisia

You could get the complete address i.e. long/lat/city/countryname using geopy:

from geopy import geocoders

Google-API-KEY = "xxx-xxxx-xxxxxxxxx-xxxxx"
gn = geocoders.GoogleV3(Google-API-KEY)
place, (lat, lng) = gn.geocode("Beroun")
print(place)

OUTPUT:

266 01 Beroun, Czechia

Once you have the country name, you can then get its abbreviation using pycountry:

import pycountry
user_input = 'Czechia'
mapping = {country.name: country.alpha_2 for country in pycountry.countries}
print(mapping.get(user_input))

OUTPUT:

CZ

Now you know, for a state, it's country and the abbreviation of it. Create a dictionary out of states and its countries, if you want the key-value paired of state-country

perhaps something like:

state_country = {'Beroun': 'CZ'}
print(state_country)

OUTPUT:

{'Beroun': 'CZ'}

This, albeit not being elegant at all, worked for me:

def country_code_converter(input_countries):
    """
    :param input_countries: list containing the name of the countries (can be numpy array)
    :return: list with the ISO alpha 3 codes for the given input ('Unknown Country' if no match found)
    """
    countries = {}
    countries_official = {}
    countries_common = {}

    #loops over all of the countries contained in the pycountry library and populates dictionary
    for country in pycountry.countries:
        countries[country.name] = country.alpha_3

    #loops over the alpha_3 codes from the countries dictionary
    #populates dictionary containing official names and codes
    for alpha_3 in list(countries.values()):
        try:
            countries_official[pycountry.countries.get(alpha_3 = alpha_3).official_name] = alpha_3
        except:
            None
    #same for common names
    for alpha_3 in list(countries.values()):
        try:
            countries_common[pycountry.countries.get(alpha_3 = alpha_3).common_name] = alpha_3
        except:
            None

    codes = []
    # appends ISO codes for all matches by trying different country name types
    # appends Unknown Country if no match found
    for i in input_countries:
        if i in countries.keys():
            codes.append(countries.get(i))

        elif i in countries_official.keys():
            codes.append(countries_official.get(i))

        elif i in countries_common.keys():
            codes.append(countries_common.get(i))

        else:
            codes.append('Unknown Country')
    return codes