diff --git a/doc/NOTES.md b/doc/NOTES.md
index da29f2c..789b9d2 100644
--- a/doc/NOTES.md
+++ b/doc/NOTES.md
@@ -22,6 +22,7 @@
 - allow handlers to specify whether to update or not (e.g. scroll)
 - API documentation
 - github pages
+- central geolocation service? (currency, weather, rtt)
 
 ## TODO
 - themes: use colors to improve theme readability
diff --git a/modules/contrib/currency.py b/modules/contrib/currency.py
index a68f9ae..d0cede9 100644
--- a/modules/contrib/currency.py
+++ b/modules/contrib/currency.py
@@ -17,13 +17,7 @@ Parameters:
 Note: source and destination names right now must correspond to the names used by the API of https://markets.ft.com
 """
 
-import bumblebee.input
-import bumblebee.output
-import bumblebee.engine
-try:
-    import requests
-except ImportError:
-    pass
+import requests
 try:
     from babel.numbers import format_currency
 except ImportError:
@@ -31,6 +25,12 @@ except ImportError:
 import json
 import os
 
+import core.module
+import core.widget
+import core.decorators
+
+import util.format
+
 SYMBOL = {
     'GBP': u'£', 'EUR': u'€', 'USD': u'$', 'JPY': u'¥', 'KRW': u'₩'
 }
@@ -40,57 +40,1015 @@ DEFAULT_SRC = 'GBP'
 API_URL = 'https://markets.ft.com/data/currencies/ajax/conversion?baseCurrency={}&comparison={}'
 LOCATION_URL = 'https://ipvigilante.com/'
 
-
 def get_local_country():
     r = requests.get(LOCATION_URL)
     location = r.json()
     return location['data']['country_name']
 
-
 def load_country_to_currency():
-    fname = os.path.join(
-        os.path.dirname(os.path.abspath(__file__)),
-        'data', 'country-by-currency-code.json')
-    with open(fname, 'r') as f:
-        data = json.load(f)
-    country2curr = {}
-    for dt in data:
-        country2curr[dt['country']] = dt['currency_code']
+    return [
+        {
+            "country": "Afghanistan",
+            "currency_code": "AFN"
+        },
+        {
+            "country": "Albania",
+            "currency_code": "ALL"
+        },
+        {
+            "country": "Algeria",
+            "currency_code": "DZD"
+        },
+        {
+            "country": "American Samoa",
+            "currency_code": "USD"
+        },
+        {
+            "country": "Andorra",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Angola",
+            "currency_code": "AOA"
+        },
+        {
+            "country": "Anguilla",
+            "currency_code": "XCD"
+        },
+        {
+            "country": "Antarctica",
+            "currency_code": "XCD"
+        },
+        {
+            "country": "Antigua and Barbuda",
+            "currency_code": "XCD"
+        },
+        {
+            "country": "Argentina",
+            "currency_code": "ARS"
+        },
+        {
+            "country": "Armenia",
+            "currency_code": "AMD"
+        },
+        {
+            "country": "Aruba",
+            "currency_code": "AWG"
+        },
+        {
+            "country": "Australia",
+            "currency_code": "AUD"
+        },
+        {
+            "country": "Austria",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Azerbaijan",
+            "currency_code": "AZN"
+        },
+        {
+            "country": "Bahamas",
+            "currency_code": "BSD"
+        },
+        {
+            "country": "Bahrain",
+            "currency_code": "BHD"
+        },
+        {
+            "country": "Bangladesh",
+            "currency_code": "BDT"
+        },
+        {
+            "country": "Barbados",
+            "currency_code": "BBD"
+        },
+        {
+            "country": "Belarus",
+            "currency_code": "BYR"
+        },
+        {
+            "country": "Belgium",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Belize",
+            "currency_code": "BZD"
+        },
+        {
+            "country": "Benin",
+            "currency_code": "XOF"
+        },
+        {
+            "country": "Bermuda",
+            "currency_code": "BMD"
+        },
+        {
+            "country": "Bhutan",
+            "currency_code": "BTN"
+        },
+        {
+            "country": "Bolivia",
+            "currency_code": "BOB"
+        },
+        {
+            "country": "Bosnia and Herzegovina",
+            "currency_code": "BAM"
+        },
+        {
+            "country": "Botswana",
+            "currency_code": "BWP"
+        },
+        {
+            "country": "Bouvet Island",
+            "currency_code": "NOK"
+        },
+        {
+            "country": "Brazil",
+            "currency_code": "BRL"
+        },
+        {
+            "country": "British Indian Ocean Territory",
+            "currency_code": "USD"
+        },
+        {
+            "country": "Brunei",
+            "currency_code": "BND"
+        },
+        {
+            "country": "Bulgaria",
+            "currency_code": "BGN"
+        },
+        {
+            "country": "Burkina Faso",
+            "currency_code": "XOF"
+        },
+        {
+            "country": "Burundi",
+            "currency_code": "BIF"
+        },
+        {
+            "country": "Cambodia",
+            "currency_code": "KHR"
+        },
+        {
+            "country": "Cameroon",
+            "currency_code": "XAF"
+        },
+        {
+            "country": "Canada",
+            "currency_code": "CAD"
+        },
+        {
+            "country": "Cape Verde",
+            "currency_code": "CVE"
+        },
+        {
+            "country": "Cayman Islands",
+            "currency_code": "KYD"
+        },
+        {
+            "country": "Central African Republic",
+            "currency_code": "XAF"
+        },
+        {
+            "country": "Chad",
+            "currency_code": "XAF"
+        },
+        {
+            "country": "Chile",
+            "currency_code": "CLP"
+        },
+        {
+            "country": "China",
+            "currency_code": "CNY"
+        },
+        {
+            "country": "Christmas Island",
+            "currency_code": "AUD"
+        },
+        {
+            "country": "Cocos (Keeling) Islands",
+            "currency_code": "AUD"
+        },
+        {
+            "country": "Colombia",
+            "currency_code": "COP"
+        },
+        {
+            "country": "Comoros",
+            "currency_code": "KMF"
+        },
+        {
+            "country": "Congo",
+            "currency_code": "XAF"
+        },
+        {
+            "country": "Cook Islands",
+            "currency_code": "NZD"
+        },
+        {
+            "country": "Costa Rica",
+            "currency_code": "CRC"
+        },
+        {
+            "country": "Croatia",
+            "currency_code": "HRK"
+        },
+        {
+            "country": "Cuba",
+            "currency_code": "CUP"
+        },
+        {
+            "country": "Cyprus",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Czech Republic",
+            "currency_code": "CZK"
+        },
+        {
+            "country": "Denmark",
+            "currency_code": "DKK"
+        },
+        {
+            "country": "Djibouti",
+            "currency_code": "DJF"
+        },
+        {
+            "country": "Dominica",
+            "currency_code": "XCD"
+        },
+        {
+            "country": "Dominican Republic",
+            "currency_code": "DOP"
+        },
+        {
+            "country": "East Timor",
+            "currency_code": "USD"
+        },
+        {
+            "country": "Ecuador",
+            "currency_code": "ECS"
+        },
+        {
+            "country": "Egypt",
+            "currency_code": "EGP"
+        },
+        {
+            "country": "El Salvador",
+            "currency_code": "SVC"
+        },
+        {
+            "country": "England",
+            "currency_code": "GBP"
+        },
+        {
+            "country": "Equatorial Guinea",
+            "currency_code": "XAF"
+        },
+        {
+            "country": "Eritrea",
+            "currency_code": "ERN"
+        },
+        {
+            "country": "Estonia",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Ethiopia",
+            "currency_code": "ETB"
+        },
+        {
+            "country": "Falkland Islands",
+            "currency_code": "FKP"
+        },
+        {
+            "country": "Faroe Islands",
+            "currency_code": "DKK"
+        },
+        {
+            "country": "Fiji Islands",
+            "currency_code": "FJD"
+        },
+        {
+            "country": "Finland",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "France",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "French Guiana",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "French Polynesia",
+            "currency_code": "XPF"
+        },
+        {
+            "country": "French Southern territories",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Gabon",
+            "currency_code": "XAF"
+        },
+        {
+            "country": "Gambia",
+            "currency_code": "GMD"
+        },
+        {
+            "country": "Georgia",
+            "currency_code": "GEL"
+        },
+        {
+            "country": "Germany",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Ghana",
+            "currency_code": "GHS"
+        },
+        {
+            "country": "Gibraltar",
+            "currency_code": "GIP"
+        },
+        {
+            "country": "Greece",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Greenland",
+            "currency_code": "DKK"
+        },
+        {
+            "country": "Grenada",
+            "currency_code": "XCD"
+        },
+        {
+            "country": "Guadeloupe",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Guam",
+            "currency_code": "USD"
+        },
+        {
+            "country": "Guatemala",
+            "currency_code": "QTQ"
+        },
+        {
+            "country": "Guinea",
+            "currency_code": "GNF"
+        },
+        {
+            "country": "Guinea-Bissau",
+            "currency_code": "CFA"
+        },
+        {
+            "country": "Guyana",
+            "currency_code": "GYD"
+        },
+        {
+            "country": "Haiti",
+            "currency_code": "HTG"
+        },
+        {
+            "country": "Heard Island and McDonald Islands",
+            "currency_code": "AUD"
+        },
+        {
+            "country": "Holy See (Vatican City State)",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Honduras",
+            "currency_code": "HNL"
+        },
+        {
+            "country": "Hong Kong",
+            "currency_code": "HKD"
+        },
+        {
+            "country": "Hungary",
+            "currency_code": "HUF"
+        },
+        {
+            "country": "Iceland",
+            "currency_code": "ISK"
+        },
+        {
+            "country": "India",
+            "currency_code": "INR"
+        },
+        {
+            "country": "Indonesia",
+            "currency_code": "IDR"
+        },
+        {
+            "country": "Iran",
+            "currency_code": "IRR"
+        },
+        {
+            "country": "Iraq",
+            "currency_code": "IQD"
+        },
+        {
+            "country": "Ireland",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Israel",
+            "currency_code": "ILS"
+        },
+        {
+            "country": "Italy",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Ivory Coast",
+            "currency_code": "XOF"
+        },
+        {
+            "country": "Jamaica",
+            "currency_code": "JMD"
+        },
+        {
+            "country": "Japan",
+            "currency_code": "JPY"
+        },
+        {
+            "country": "Jordan",
+            "currency_code": "JOD"
+        },
+        {
+            "country": "Kazakhstan",
+            "currency_code": "KZT"
+        },
+        {
+            "country": "Kenya",
+            "currency_code": "KES"
+        },
+        {
+            "country": "Kiribati",
+            "currency_code": "AUD"
+        },
+        {
+            "country": "Kuwait",
+            "currency_code": "KWD"
+        },
+        {
+            "country": "Kyrgyzstan",
+            "currency_code": "KGS"
+        },
+        {
+            "country": "Laos",
+            "currency_code": "LAK"
+        },
+        {
+            "country": "Latvia",
+            "currency_code": "LVL"
+        },
+        {
+            "country": "Lebanon",
+            "currency_code": "LBP"
+        },
+        {
+            "country": "Lesotho",
+            "currency_code": "LSL"
+        },
+        {
+            "country": "Liberia",
+            "currency_code": "LRD"
+        },
+        {
+            "country": "Libyan Arab Jamahiriya",
+            "currency_code": "LYD"
+        },
+        {
+            "country": "Liechtenstein",
+            "currency_code": "CHF"
+        },
+        {
+            "country": "Lithuania",
+            "currency_code": "LTL"
+        },
+        {
+            "country": "Luxembourg",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Macao",
+            "currency_code": "MOP"
+        },
+        {
+            "country": "North Macedonia",
+            "currency_code": "MKD"
+        },
+        {
+            "country": "Madagascar",
+            "currency_code": "MGF"
+        },
+        {
+            "country": "Malawi",
+            "currency_code": "MWK"
+        },
+        {
+            "country": "Malaysia",
+            "currency_code": "MYR"
+        },
+        {
+            "country": "Maldives",
+            "currency_code": "MVR"
+        },
+        {
+            "country": "Mali",
+            "currency_code": "XOF"
+        },
+        {
+            "country": "Malta",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Marshall Islands",
+            "currency_code": "USD"
+        },
+        {
+            "country": "Martinique",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Mauritania",
+            "currency_code": "MRO"
+        },
+        {
+            "country": "Mauritius",
+            "currency_code": "MUR"
+        },
+        {
+            "country": "Mayotte",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Mexico",
+            "currency_code": "MXN"
+        },
+        {
+            "country": "Micronesia, Federated States of",
+            "currency_code": "USD"
+        },
+        {
+            "country": "Moldova",
+            "currency_code": "MDL"
+        },
+        {
+            "country": "Monaco",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Mongolia",
+            "currency_code": "MNT"
+        },
+        {
+            "country": "Montserrat",
+            "currency_code": "XCD"
+        },
+        {
+            "country": "Morocco",
+            "currency_code": "MAD"
+        },
+        {
+            "country": "Mozambique",
+            "currency_code": "MZN"
+        },
+        {
+            "country": "Myanmar",
+            "currency_code": "MMR"
+        },
+        {
+            "country": "Namibia",
+            "currency_code": "NAD"
+        },
+        {
+            "country": "Nauru",
+            "currency_code": "AUD"
+        },
+        {
+            "country": "Nepal",
+            "currency_code": "NPR"
+        },
+        {
+            "country": "Netherlands",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Netherlands Antilles",
+            "currency_code": "ANG"
+        },
+        {
+            "country": "New Caledonia",
+            "currency_code": "XPF"
+        },
+        {
+            "country": "New Zealand",
+            "currency_code": "NZD"
+        },
+        {
+            "country": "Nicaragua",
+            "currency_code": "NIO"
+        },
+        {
+            "country": "Niger",
+            "currency_code": "XOF"
+        },
+        {
+            "country": "Nigeria",
+            "currency_code": "NGN"
+        },
+        {
+            "country": "Niue",
+            "currency_code": "NZD"
+        },
+        {
+            "country": "Norfolk Island",
+            "currency_code": "AUD"
+        },
+        {
+            "country": "North Korea",
+            "currency_code": "KPW"
+        },
+        {
+            "country": "Northern Ireland",
+            "currency_code": "GBP"
+        },
+        {
+            "country": "Northern Mariana Islands",
+            "currency_code": "USD"
+        },
+        {
+            "country": "Norway",
+            "currency_code": "NOK"
+        },
+        {
+            "country": "Oman",
+            "currency_code": "OMR"
+        },
+        {
+            "country": "Pakistan",
+            "currency_code": "PKR"
+        },
+        {
+            "country": "Palau",
+            "currency_code": "USD"
+        },
+        {
+            "country": "Palestine",
+            "currency_code": null
+        },
+        {
+            "country": "Panama",
+            "currency_code": "PAB"
+        },
+        {
+            "country": "Papua New Guinea",
+            "currency_code": "PGK"
+        },
+        {
+            "country": "Paraguay",
+            "currency_code": "PYG"
+        },
+        {
+            "country": "Peru",
+            "currency_code": "PEN"
+        },
+        {
+            "country": "Philippines",
+            "currency_code": "PHP"
+        },
+        {
+            "country": "Pitcairn",
+            "currency_code": "NZD"
+        },
+        {
+            "country": "Poland",
+            "currency_code": "PLN"
+        },
+        {
+            "country": "Portugal",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Puerto Rico",
+            "currency_code": "USD"
+        },
+        {
+            "country": "Qatar",
+            "currency_code": "QAR"
+        },
+        {
+            "country": "Reunion",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Romania",
+            "currency_code": "RON"
+        },
+        {
+            "country": "Russian Federation",
+            "currency_code": "RUB"
+        },
+        {
+            "country": "Rwanda",
+            "currency_code": "RWF"
+        },
+        {
+            "country": "Saint Helena",
+            "currency_code": "SHP"
+        },
+        {
+            "country": "Saint Kitts and Nevis",
+            "currency_code": "XCD"
+        },
+        {
+            "country": "Saint Lucia",
+            "currency_code": "XCD"
+        },
+        {
+            "country": "Saint Pierre and Miquelon",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Saint Vincent and the Grenadines",
+            "currency_code": "XCD"
+        },
+        {
+            "country": "Samoa",
+            "currency_code": "WST"
+        },
+        {
+            "country": "San Marino",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Sao Tome and Principe",
+            "currency_code": "STD"
+        },
+        {
+            "country": "Saudi Arabia",
+            "currency_code": "SAR"
+        },
+        {
+            "country": "Scotland",
+            "currency_code": "GBP"
+        },
+        {
+            "country": "Senegal",
+            "currency_code": "XOF"
+        },
+        {
+            "country": "Seychelles",
+            "currency_code": "SCR"
+        },
+        {
+            "country": "Sierra Leone",
+            "currency_code": "SLL"
+        },
+        {
+            "country": "Singapore",
+            "currency_code": "SGD"
+        },
+        {
+            "country": "Slovakia",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Slovenia",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "Solomon Islands",
+            "currency_code": "SBD"
+        },
+        {
+            "country": "Somalia",
+            "currency_code": "SOS"
+        },
+        {
+            "country": "South Africa",
+            "currency_code": "ZAR"
+        },
+        {
+            "country": "South Georgia and the South Sandwich Islands",
+            "currency_code": "GBP"
+        },
+        {
+            "country": "South Korea",
+            "currency_code": "KRW"
+        },
+        {
+            "country": "South Sudan",
+            "currency_code": "SSP"
+        },
+        {
+            "country": "Spain",
+            "currency_code": "EUR"
+        },
+        {
+            "country": "SriLanka",
+            "currency_code": "LKR"
+        },
+        {
+            "country": "Sudan",
+            "currency_code": "SDG"
+        },
+        {
+            "country": "Suriname",
+            "currency_code": "SRD"
+        },
+        {
+            "country": "Svalbard and Jan Mayen",
+            "currency_code": "NOK"
+        },
+        {
+            "country": "Swaziland",
+            "currency_code": "SZL"
+        },
+        {
+            "country": "Sweden",
+            "currency_code": "SEK"
+        },
+        {
+            "country": "Switzerland",
+            "currency_code": "CHF"
+        },
+        {
+            "country": "Syria",
+            "currency_code": "SYP"
+        },
+        {
+            "country": "Tajikistan",
+            "currency_code": "TJS"
+        },
+        {
+            "country": "Tanzania",
+            "currency_code": "TZS"
+        },
+        {
+            "country": "Thailand",
+            "currency_code": "THB"
+        },
+        {
+            "country": "The Democratic Republic of Congo",
+            "currency_code": "CDF"
+        },
+        {
+            "country": "Togo",
+            "currency_code": "XOF"
+        },
+        {
+            "country": "Tokelau",
+            "currency_code": "NZD"
+        },
+        {
+            "country": "Tonga",
+            "currency_code": "TOP"
+        },
+        {
+            "country": "Trinidad and Tobago",
+            "currency_code": "TTD"
+        },
+        {
+            "country": "Tunisia",
+            "currency_code": "TND"
+        },
+        {
+            "country": "Turkey",
+            "currency_code": "TRY"
+        },
+        {
+            "country": "Turkmenistan",
+            "currency_code": "TMT"
+        },
+        {
+            "country": "Turks and Caicos Islands",
+            "currency_code": "USD"
+        },
+        {
+            "country": "Tuvalu",
+            "currency_code": "AUD"
+        },
+        {
+            "country": "Uganda",
+            "currency_code": "UGX"
+        },
+        {
+            "country": "Ukraine",
+            "currency_code": "UAH"
+        },
+        {
+            "country": "United Arab Emirates",
+            "currency_code": "AED"
+        },
+        {
+            "country": "United Kingdom",
+            "currency_code": "GBP"
+        },
+        {
+            "country": "United States",
+            "currency_code": "USD"
+        },
+        {
+            "country": "United States Minor Outlying Islands",
+            "currency_code": "USD"
+        },
+        {
+            "country": "Uruguay",
+            "currency_code": "UYU"
+        },
+        {
+            "country": "Uzbekistan",
+            "currency_code": "UZS"
+        },
+        {
+            "country": "Vanuatu",
+            "currency_code": "VUV"
+        },
+        {
+            "country": "Venezuela",
+            "currency_code": "VEF"
+        },
+        {
+            "country": "Vietnam",
+            "currency_code": "VND"
+        },
+        {
+            "country": "Virgin Islands, British",
+            "currency_code": "USD"
+        },
+        {
+            "country": "Virgin Islands, U.S.",
+            "currency_code": "USD"
+        },
+        {
+            "country": "Wales",
+            "currency_code": "GBP"
+        },
+        {
+            "country": "Wallis and Futuna",
+            "currency_code": "XPF"
+        },
+        {
+            "country": "Western Sahara",
+            "currency_code": "MAD"
+        },
+        {
+            "country": "Yemen",
+            "currency_code": "YER"
+        },
+        {
+            "country": "Yugoslavia",
+            "currency_code": null
+        },
+        {
+            "country": "Zambia",
+            "currency_code": "ZMW"
+        },
+        {
+            "country": "Zimbabwe",
+            "currency_code": "ZWD"
+        }
+    ]
 
-    return country2curr
+class Module(core.module.Module):
+    @core.decorators.every(minutes=5)
+    def __init__(self, config):
+        super().__init__(config, core.widget.Widget(self.price))
 
-
-class Module(bumblebee.engine.Module):
-    def __init__(self, engine, config):
-        super(Module, self).__init__(engine, config,
-            bumblebee.output.Widget(full_text=self.price)
-        )
-        self._data = []
-        self.interval_factor(60)
-        self.interval(1)
-        self._nextcheck = 0
+        self.__data = []
 
         src = self.parameter('source', DEFAULT_SRC)
         if src == 'auto':
-            self._base = self.find_local_currency()
+            self.__base = self.find_local_currency()
         else:
-            self._base = src
+            self.__base = src
 
-        self._symbols = []
-        for d in self.parameter('destination', DEFAULT_DEST).split(','):
+        self.__symbols = []
+        for d in util.format.aslist(self.parameter('destination', DEFAULT_DEST)):
             if d == 'auto':
                 new = self.find_local_currency()
             else:
                 new = d
-            if new != self._base:
-                self._symbols.append(new)
+            if new != self.__base:
+                self.__symbols.append(new)
 
     def price(self, widget):
-        if len(self._data) == 0:
+        if len(self.__data) == 0:
             return '?'
 
         rates = []
-        for sym, rate in self._data:
+        for sym, rate in self.__data:
             rate_float = float(rate.replace(',',''))
             if format_currency:
                 rates.append(format_currency(rate_float, sym))
@@ -102,19 +1060,19 @@ class Module(bumblebee.engine.Module):
         ratefmt = u'{}'.format(self.parameter('destinationdelimiter', '='))
 
         if format_currency:
-            base_val = format_currency(1, self._base)
+            base_val = format_currency(1, self.__base)
         else:
-            base_val = '1{}'.format(SYMBOL[self._base] if self._base in SYMBOL else self._base)
+            base_val = '1{}'.format(SYMBOL[self.__base] if self.__base in SYMBOL else self.__base)
 
         return basefmt.format(base_val, ratefmt.join(rates))
 
-    def update(self, widgets):
-        self._data = []
-        for symbol in self._symbols:
-            url = API_URL.format(self._base, symbol)
+    def update(self):
+        self.__data = []
+        for symbol in self.__symbols:
+            url = API_URL.format(self.__base, symbol)
             try:
                 response = requests.get(url).json()
-                self._data.append((symbol, response['data']['exchangeRate']))
+                self.__data.append((symbol, response['data']['exchangeRate']))
             except Exception:
                 pass