Mostly PyLint and Flake8 updates.

Rewrote imports of exceptions to be from the exceptions module.
Made nmap scanner check for libnmap dependency without crashing.
Various flake8 and pylint updates.

homeassistant/__main__.py

@@ -108,10 +108,9 @@ def main():
         def open_browser(event):
             """ Open the webinterface in a browser. """
             if hass.config.api is not None:
-                from homeassistant.const import EVENT_HOMEASSISTANT_START
                 import webbrowser
                 webbrowser.open(hass.config.api.base_url)
-
+        from homeassistant.const import EVENT_HOMEASSISTANT_START
         hass.bus.listen_once(EVENT_HOMEASSISTANT_START, open_browser)
 
     hass.start()

homeassistant/bootstrap.py

@@ -10,6 +10,7 @@ start by calling homeassistant.start_home_assistant(bus)
 """
 
 import os
+import sys
 import logging
 from collections import defaultdict
 

homeassistant/components/device_tracker/nmap_tracker.py

@@ -26,8 +26,12 @@ from collections import namedtuple
 import subprocess
 import re
 
-from libnmap.process import NmapProcess
-from libnmap.parser import NmapParser, NmapParserException
+try:
+    from libnmap.process import NmapProcess
+    from libnmap.parser import NmapParser, NmapParserException
+    LIB_LOADED = True
+except ImportError:
+    LIB_LOADED = False
 
 import homeassistant.util.dt as dt_util
 from homeassistant.const import CONF_HOSTS
@@ -52,6 +56,10 @@ def get_scanner(hass, config):
                            _LOGGER):
         return None
 
+    if not LIB_LOADED:
+        _LOGGER.error("Error while importing dependency python-libnmap.")
+        return False
+
     scanner = NmapDeviceScanner(config[DOMAIN])
 
     return scanner if scanner.success_init else None

homeassistant/components/mqtt.py

@@ -46,7 +46,7 @@ The keep alive in seconds for this client. Default is 60.
 import logging
 import socket
 
-from homeassistant.core import HomeAssistantError
+from homeassistant.exceptions import HomeAssistantError
 import homeassistant.util as util
 from homeassistant.helpers import validate_config
 from homeassistant.const import (

homeassistant/core.py

@@ -7,7 +7,6 @@ of entities and react to changes.
 """
 
 import os
-import sys
 import time
 import logging
 import threading
@@ -23,7 +22,7 @@ from homeassistant.const import (
     EVENT_SERVICE_EXECUTED, ATTR_SERVICE_CALL_ID, EVENT_SERVICE_REGISTERED,
     TEMP_CELCIUS, TEMP_FAHRENHEIT, ATTR_FRIENDLY_NAME)
 from homeassistant.exceptions import (
-    HomeAssistantError, InvalidEntityFormatError, NoEntitySpecifiedError)
+    HomeAssistantError, InvalidEntityFormatError)
 import homeassistant.util as util
 import homeassistant.util.dt as date_util
 import homeassistant.helpers.temperature as temp_helper

homeassistant/exceptions.py

@@ -1,5 +1,6 @@
 """ Exceptions used by Home Assistant """
 
+
 class HomeAssistantError(Exception):
     """ General Home Assistant exception occured. """
     pass

homeassistant/helpers/entity.py

@@ -7,7 +7,7 @@ Provides ABC for entities in HA.
 
 from collections import defaultdict
 
-from homeassistant.core import NoEntitySpecifiedError
+from homeassistant.exceptions import NoEntitySpecifiedError
 
 from homeassistant.const import (
     ATTR_FRIENDLY_NAME, ATTR_UNIT_OF_MEASUREMENT, ATTR_HIDDEN,

homeassistant/remote.py

@@ -18,6 +18,7 @@ import urllib.parse
 import requests
 
 import homeassistant.core as ha
+from homeassistant.exceptions import HomeAssistantError
 import homeassistant.bootstrap as bootstrap
 
 from homeassistant.const import (
@@ -84,12 +85,12 @@ class API(object):
 
         except requests.exceptions.ConnectionError:
             _LOGGER.exception("Error connecting to server")
-            raise ha.HomeAssistantError("Error connecting to server")
+            raise HomeAssistantError("Error connecting to server")
 
         except requests.exceptions.Timeout:
             error = "Timeout when talking to {}".format(self.host)
             _LOGGER.exception(error)
-            raise ha.HomeAssistantError(error)
+            raise HomeAssistantError(error)
 
     def __repr__(self):
         return "API({}, {}, {})".format(
@@ -102,7 +103,7 @@ class HomeAssistant(ha.HomeAssistant):
 
     def __init__(self, remote_api, local_api=None):
         if not remote_api.validate_api():
-            raise ha.HomeAssistantError(
+            raise HomeAssistantError(
                 "Remote API at {}:{} not valid: {}".format(
                     remote_api.host, remote_api.port, remote_api.status))
 
@@ -121,7 +122,7 @@ class HomeAssistant(ha.HomeAssistant):
         # Ensure a local API exists to connect with remote
         if self.config.api is None:
             if not bootstrap.setup_component(self, 'api'):
-                raise ha.HomeAssistantError(
+                raise HomeAssistantError(
                     'Unable to setup local API to receive events')
 
         ha.create_timer(self)
@@ -132,7 +133,7 @@ class HomeAssistant(ha.HomeAssistant):
         # Setup that events from remote_api get forwarded to local_api
         # Do this after we fire START, otherwise HTTP is not started
         if not connect_remote_events(self.remote_api, self.config.api):
-            raise ha.HomeAssistantError((
+            raise HomeAssistantError((
                 'Could not setup event forwarding from api {} to '
                 'local api {}').format(self.remote_api, self.config.api))
 
@@ -293,7 +294,7 @@ def validate_api(api):
         else:
             return APIStatus.UNKNOWN
 
-    except ha.HomeAssistantError:
+    except HomeAssistantError:
         return APIStatus.CANNOT_CONNECT
 
 
@@ -318,7 +319,7 @@ def connect_remote_events(from_api, to_api):
 
             return False
 
-    except ha.HomeAssistantError:
+    except HomeAssistantError:
         _LOGGER.exception("Error setting up event forwarding")
         return False
 
@@ -342,7 +343,7 @@ def disconnect_remote_events(from_api, to_api):
 
             return False
 
-    except ha.HomeAssistantError:
+    except HomeAssistantError:
         _LOGGER.exception("Error removing an event forwarder")
         return False
 
@@ -354,7 +355,7 @@ def get_event_listeners(api):
 
         return req.json() if req.status_code == 200 else {}
 
-    except (ha.HomeAssistantError, ValueError):
+    except (HomeAssistantError, ValueError):
         # ValueError if req.json() can't parse the json
         _LOGGER.exception("Unexpected result retrieving event listeners")
 
@@ -371,7 +372,7 @@ def fire_event(api, event_type, data=None):
             _LOGGER.error("Error firing event: %d - %d",
                           req.status_code, req.text)
 
-    except ha.HomeAssistantError:
+    except HomeAssistantError:
         _LOGGER.exception("Error firing event")
 
 
@@ -387,7 +388,7 @@ def get_state(api, entity_id):
         return ha.State.from_dict(req.json()) \
             if req.status_code == 200 else None
 
-    except (ha.HomeAssistantError, ValueError):
+    except (HomeAssistantError, ValueError):
         # ValueError if req.json() can't parse the json
         _LOGGER.exception("Error fetching state")
 
@@ -404,7 +405,7 @@ def get_states(api):
         return [ha.State.from_dict(item) for
                 item in req.json()]
 
-    except (ha.HomeAssistantError, ValueError, AttributeError):
+    except (HomeAssistantError, ValueError, AttributeError):
         # ValueError if req.json() can't parse the json
         _LOGGER.exception("Error fetching states")
 
@@ -434,7 +435,7 @@ def set_state(api, entity_id, new_state, attributes=None):
         else:
             return True
 
-    except ha.HomeAssistantError:
+    except HomeAssistantError:
         _LOGGER.exception("Error setting state")
 
         return False
@@ -457,7 +458,7 @@ def get_services(api):
 
         return req.json() if req.status_code == 200 else {}
 
-    except (ha.HomeAssistantError, ValueError):
+    except (HomeAssistantError, ValueError):
         # ValueError if req.json() can't parse the json
         _LOGGER.exception("Got unexpected services result")
 
@@ -475,5 +476,5 @@ def call_service(api, domain, service, service_data=None):
             _LOGGER.error("Error calling service: %d - %s",
                           req.status_code, req.text)
 
-    except ha.HomeAssistantError:
+    except HomeAssistantError:
         _LOGGER.exception("Error calling service")