zulip_bots: Check API key on initialization for Weather bot.

zulip_bots/zulip_bots/bots/weather/weather.py

@@ -1,6 +1,7 @@
 # See readme.md for instructions on running this code.
 import requests
 import json
+import logging
 
 from typing import Any, Dict
 
@@ -8,6 +9,17 @@ class WeatherHandler(object):
     def initialize(self, bot_handler: Any) -> None:
         self.api_key = bot_handler.get_config_info('weather')['key']
         self.response_pattern = 'Weather in {}, {}:\n{:.2f} F / {:.2f} C\n{}'
+        self.check_api_key()
+
+    def check_api_key(self) -> None:
+        url = 'http://api.openweathermap.org/data/2.5/weather?q=nyc&APPID=' + self.api_key
+        test_response = requests.get(url)
+        try:
+            test_response_data = test_response.json()
+            if test_response_data['cod'] == 401:
+                logging.error('API Key not valid. Please see doc.md to find out how to get it.')
+        except KeyError:
+            pass
 
     def usage(self) -> str:
         return '''