enable flake8 and fix all linting errors

Author: whummer

Makefile

@@ -100,7 +100,7 @@ reinstall-p3:      ## Re-initialize the virtualenv with Python 3.x
 	PIP_CMD=pip3 VENV_OPTS="-p `which python3`" make install
 
 lint:              ## Run code linter to check code style
-	($(VENV_RUN); pep8 --max-line-length=120 --ignore=E128 --exclude=node_modules,$(VENV_DIR)*,dist .)
+	($(VENV_RUN); flake8 --show-source --max-line-length=120 --ignore=E128 --exclude=node_modules,$(VENV_DIR)*,dist .)
 
 clean:             ## Clean up (npm dependencies, downloaded infrastructure code, compiled Java classes)
 	rm -rf localstack/dashboard/web/node_modules/

localstack/config.py

@@ -2,9 +2,9 @@
 import os
 import subprocess
 import tempfile
-from six import iteritems
-from localstack.constants import *
 from os.path import expanduser
+from six import iteritems
+from localstack.constants import DEFAULT_SERVICE_PORTS, LOCALHOST, PATH_USER_REQUEST
 
 # randomly inject faults to Kinesis
 KINESIS_ERROR_PROBABILITY = float(os.environ.get('KINESIS_ERROR_PROBABILITY', '').strip() or 0.0)
@@ -134,4 +134,5 @@ def service_port(service_key):
 
 
 # set URL pattern of inbound API gateway
-INBOUND_GATEWAY_URL_PATTERN = '%s/restapis/{api_id}/{stage_name}/%s{path}' % (TEST_APIGATEWAY_URL, PATH_USER_REQUEST)
+INBOUND_GATEWAY_URL_PATTERN = ('%s/restapis/{api_id}/{stage_name}/%s{path}' %
+    (TEST_APIGATEWAY_URL, PATH_USER_REQUEST))  # flake8: noqa