Fixes.

config.py

@@ -15,10 +15,10 @@ class Config(metaclass=Singleton):
     * `teletoken`: telegram api token.
     * `bot_owner`: telegram id of bot owner.
     """
-    base_url: str
-    port: int
-    teletoken: str
-    bot_owner: int
+    base_url: str = ''
+    port: int = 3001
+    teletoken: str = ''
+    bot_owner: int = 0
 
 
 class ConfigError(Exception):
@@ -28,7 +28,8 @@ class ConfigError(Exception):
 
 def _get_teletoken(cmd_arguments: Namespace) -> str:
     """
-        Get Telegram bot token.
+        Get Telegram bot token from command line arguments or
+        **LTLNOTIFYER_TELETOKEN** environment variable.
         Can raise **ConfigError** if Telegram token not set or incorrect.
 
         :param cmd_arguments: command line arguments.
@@ -46,13 +47,14 @@ def _get_teletoken(cmd_arguments: Namespace) -> str:
 
 def _get_bot_owner_id(cmd_arguments: Namespace) -> int:
     """
-        Get bot owner telegram id.
+        Get bot owner telegram id from command line arguments or
+        **LTLNOTIFYER_BOT_OWNER** environment variable.
         Can raise **ConfigError** if bot owner id not set or incorrect.
 
-        :param cmd_arguments: command line arguments.
+        :param cmd_arguments: command line arguments object.
         :return: bot owner Telegram id.
     """
-    bot_owner = getenv('LTLNOTIFYER_BOT_OWNER')
+    bot_owner = cmd_arguments.owner or getenv('LTLNOTIFYER_BOT_OWNER')
     if not bot_owner:
         raise ConfigError('Bot owner telegram id not set.')
     try:
@@ -66,32 +68,42 @@ def _get_bot_owner_id(cmd_arguments: Namespace) -> int:
 
 def _get_base_url(cmd_arguments: Namespace) -> str:
     """
-        Get server base url.
+        Get server base url from command line arguments or
+        **LTLNOTIFYER_BASE_URL** environment variable.
         Can raise **Config error** if base url not set.
 
-        :param cmd_arguments: command line arguments.
+        :param cmd_arguments: command line arguments object.
         :return: server base url.
         """
     base_url = cmd_arguments.base_url or getenv('LTLNOTIFYER_BASE_URL')
     if not base_url:
         raise ConfigError('Server base url not set.')
+    return base_url
 
 
 def _get_port(cmd_arguments: Namespace) -> int:
     """
-        Get server port.
+    Get server port from command line arguments or
+    **LTLNOTIFYER_PORT** environment variable.
 
-        :param cmd_arguments: command line arguments.
-        :return:
-        """
+    :param cmd_arguments: command line arguments object.
+    :return: port number or 3001 if port not set or incorrect.
+    """
     port = cmd_arguments.port or getenv('LTLNOTIFIER_PORT', default='')
     port = int(port) if port.isdigit() else 3001
+    return port
 
 
-def _init_config(arguments) -> None:
+def _init_config(arguments: Namespace) -> None:
+    """
+    Initialisation Config singleton.
+
+    :param arguments: command line arguments object.
+    """
     teletoken = _get_teletoken(arguments)
     bot_owner = _get_bot_owner_id(arguments)
-    base_url, port = _get_base_url(arguments)
+    base_url = _get_base_url(arguments)
+    port = _get_port(arguments)
     Config(teletoken=teletoken,
            port=port,
            bot_owner=bot_owner,
@@ -114,7 +126,7 @@ _parser.add_argument('--base_url', default='',
 _parser.add_argument('--port', default='',
                      help='Server port (default = 3001. \n'
                           'Can be set in LTLNOTIFYER_PORT environment '
-                          'variable.')
+                          'variable.)')
 
 _init_config(_parser.parse_args())