diff --git a/.travis.yml b/.travis.yml
index 17c0776..5b7907e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ install:
   - make dependencies
 
 script:
+  - make lint
   - make test
   - make coverage_publish
   - make coverage_report
diff --git a/Makefile b/Makefile
index 5469bf1..bafd245 100644
--- a/Makefile
+++ b/Makefile
@@ -22,8 +22,11 @@ coverage_publish:
 coverage_report:
 	pipenv run python -m coverage report --fail-under 90
 
+lint:
+	pipenv run pycodestyle stw_potsdam tests
+
 clean:
 	pipenv run python -m coverage erase
 	rm -rf .pytest_cache .cache
 
-.PHONY: dependencies run debug test test_debug coverage_publish coverage_report clean
+.PHONY: dependencies run debug test test_debug coverage_publish coverage_report lint clean
diff --git a/Pipfile b/Pipfile
index f8381f2..19ccb00 100644
--- a/Pipfile
+++ b/Pipfile
@@ -8,3 +8,5 @@ pytest = "*"
 coveralls = "*"
 pytest-cov = "*"
 httpretty = "*"
+pycodestyle = "*"
+
diff --git a/Pipfile.lock b/Pipfile.lock
index 2a878bb..3551593 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "7ba9cecb08807ab00a9a85ce40a9f66e5088b1f51b683c09b7be92ca55792ab3"
+            "sha256": "7d175b6dd121a91ba3e19ab1d19cf724275d1de5bb682dba5ea0d337fc011ba4"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -345,6 +345,14 @@
             ],
             "version": "==1.7.0"
         },
+        "pycodestyle": {
+            "hashes": [
+                "sha256:cbc619d09254895b0d12c2c691e237b2e91e9b2ecf5e84c26b35400f93dcfb83",
+                "sha256:cbfca99bd594a10f674d0cd97a3d802a1fdef635d4361e1a2658de47ed261e3a"
+            ],
+            "index": "pypi",
+            "version": "==2.4.0"
+        },
         "pycparser": {
             "hashes": [
                 "sha256:a988718abfad80b6b157acce7bf130a30876d27603738ac39f140993246b25b3"
diff --git a/stw_potsdam/canteen.py b/stw_potsdam/canteen.py
index e716e0c..07f85d8 100644
--- a/stw_potsdam/canteen.py
+++ b/stw_potsdam/canteen.py
@@ -2,4 +2,5 @@
 
 from collections import namedtuple
 
-Canteen = namedtuple('Canteen', ('key', 'name', 'street', 'city', 'id', 'chash'))
+Canteen = namedtuple('Canteen',
+                     ('key', 'name', 'street', 'city', 'id', 'chash'))
diff --git a/stw_potsdam/canteen_api.py b/stw_potsdam/canteen_api.py
index da4be6a..8f97216 100644
--- a/stw_potsdam/canteen_api.py
+++ b/stw_potsdam/canteen_api.py
@@ -6,7 +6,8 @@ from collections import namedtuple
 
 MenuParams = namedtuple('MenuParams', ('canteen_id', 'chash'))
 
-URL = 'https://www.studentenwerk-potsdam.de/essen/unsere-mensen-cafeterien/detailinfos/'
+URL = 'https://www.studentenwerk-potsdam.de' + \
+      '/essen/unsere-mensen-cafeterien/detailinfos/'
 
 
 def _param_json(it):
diff --git a/stw_potsdam/feed.py b/stw_potsdam/feed.py
index 443ba46..b83e751 100644
--- a/stw_potsdam/feed.py
+++ b/stw_potsdam/feed.py
@@ -33,8 +33,10 @@ def _prices(offer):
 
         price = offer[api_role]
         # When no price is set, this can be empty dict
-        if (isinstance(price, unicode) or isinstance(price, str)) and price.strip():
-            result[role] = str(price)  # Convert unicode to str for PyOpenMensa -> misses type check
+        if (isinstance(price, unicode) or isinstance(price, str)) \
+                and price.strip():
+            # Convert unicode to str for PyOpenMensa -> misses type check
+            result[role] = str(price)
 
     return result
 
@@ -65,6 +67,14 @@ def render_meta(canteen, menu_feed_url):
     builder.address = canteen.street
     builder.city = canteen.city
 
-    builder.define(name="full", priority="0", url=menu_feed_url, source=None, dayOfWeek="*", dayOfMonth="*", hour="8-18", minute="0", retry="30 1")
+    builder.define(name='full',
+                   priority='0',
+                   url=menu_feed_url,
+                   source=None,
+                   dayOfWeek='*',
+                   dayOfMonth='*',
+                   hour='8-18',
+                   minute='0',
+                   retry='30 1')
 
     return builder.toXMLFeed()
diff --git a/stw_potsdam/views.py b/stw_potsdam/views.py
index 8da10e7..7aa97a2 100644
--- a/stw_potsdam/views.py
+++ b/stw_potsdam/views.py
@@ -15,7 +15,7 @@ CACHE_TIMEOUT = 45 * 60
 app = Flask(__name__)
 app.url_map.strict_slashes = False
 
-if 'BASE_URL' in os.environ: # pragma: no cover
+if 'BASE_URL' in os.environ:  # pragma: no cover
     base_url = urlparse.urlparse(os.environ.get('BASE_URL'))
     if base_url.scheme:
         app.config['PREFERRED_URL_SCHEME'] = base_url.scheme
@@ -30,8 +30,8 @@ cache = SimpleCache()
 def canteen_not_found(config, canteen_name):
     app.logger.warn('Canteen %s not found', canteen_name)
     configured = ', '.join("'{}'".format(c) for c in config.keys())
-    message = "Canteen '{canteen}' not found, available: {configured}".format(canteen=canteen_name,
-                                                                              configured=configured)
+    message = "Canteen '{0}' not found, available: {1}".format(canteen_name,
+                                                               configured)
     return make_response(message, 404)
 
 
@@ -62,7 +62,9 @@ def canteen_menu_feed_xml(menu):
 
 
 def canteen_meta_feed_xml(canteen):
-    menu_feed_url = url_for('canteen_menu_feed', canteen_name=canteen.key, _external=True)
+    menu_feed_url = url_for('canteen_menu_feed',
+                            canteen_name=canteen.key,
+                            _external=True)
     xml = feed.render_meta(canteen, menu_feed_url)
     return _canteen_feed_xml(xml)
 
@@ -95,7 +97,10 @@ def canteen_menu_feed(canteen_name):
 @app.route('/canteens')
 def canteen_index():
     config = read_canteen_config()
-    return jsonify({key: url_for('canteen_meta_feed', canteen_name=key, _external=True) for key in config})
+    return jsonify({
+        key: url_for('canteen_meta_feed', canteen_name=key, _external=True)
+        for key in config
+    })
 
 
 @app.route('/health_check')
diff --git a/tests/response_util.py b/tests/response_util.py
index fd90948..5e7047c 100644
--- a/tests/response_util.py
+++ b/tests/response_util.py
@@ -5,9 +5,11 @@ from xml.etree import ElementTree
 def meal_names(response):
     """Extract meal names from OpenMensa XML.
 
-    By no means below parsing is robust or complete. Below just helps ensuring that the parser indeed returns proper XML
-    instead of arbitrary responses."""
+    By no means below parsing is robust or complete. Below just helps ensuring
+    that the parser indeed returns proper XML instead of arbitrary responses.
+    """
     root = ElementTree.fromstring(response)
     namespace = {'om': 'http://openmensa.org/open-mensa-v2'}
-    nodes = root.findall('om:canteen/om:day/om:category/om:meal/om:name', namespace)
+    nodes = root.findall('om:canteen/om:day/om:category/om:meal/om:name',
+                         namespace)
     return [node.text for node in nodes]
diff --git a/tests/stub_api.py b/tests/stub_api.py
index 9e899dc..1e4fd5e 100644
--- a/tests/stub_api.py
+++ b/tests/stub_api.py
@@ -21,7 +21,8 @@ def api_online_one_shot():
     Subsequent API invocations will return with HTTP status code 500."""
 
     def canned_menu(request, uri, response_headers):
-        path = os.path.join(os.path.dirname(__file__), 'resources', 'input.json')
+        path = os.path.join(os.path.dirname(__file__),
+                            'resources', 'input.json')
         with open(path) as f:
             return 200, response_headers, f.read()
 
@@ -30,7 +31,10 @@ def api_online_one_shot():
         httpretty.Response(body='invalid', status=500),
     ]
 
-    httpretty.register_uri(httpretty.POST,  canteen_api.URL, responses=responses)
+    httpretty.register_uri(httpretty.POST,
+                           canteen_api.URL,
+                           responses=responses)
+
     httpretty.enable(allow_net_connect=False)
     yield httpretty
     httpretty.disable()
diff --git a/tests/test_retrieval.py b/tests/test_retrieval.py
index 8d2fb9a..b8c82be 100644
--- a/tests/test_retrieval.py
+++ b/tests/test_retrieval.py
@@ -26,12 +26,14 @@ def is_enabled():
 
 requires_online_api = pytest.mark.skipif(
     not is_enabled(),
-    reason='Querying the online API is disabled. Turn on by setting env variable %s.' % ENV_ENABLED
+    reason='Querying the online API is disabled. '
+           'Turn on by setting env variable %s.' % ENV_ENABLED
 )
 
 
 @requires_online_api
 def test_retrieval(canteen):
     feed.render_meta(canteen, "/canteens/{}/menu".format(canteen.key))
-    menu = download_menu(MenuParams(canteen_id=canteen.id, chash=canteen.chash))
+    params = MenuParams(canteen_id=canteen.id, chash=canteen.chash)
+    menu = download_menu(params)
     feed.render_menu(menu)
diff --git a/tests/test_views.py b/tests/test_views.py
index f06d335..421623f 100644
--- a/tests/test_views.py
+++ b/tests/test_views.py
@@ -24,7 +24,10 @@ def test_index(client):
     assert canteen.status_code == 200, 'Canteen URL is reachable'
 
 
-@pytest.mark.parametrize('url', ['/canteens/spam', '/canteens/spam/meta', '/canteens/spam/menu'])
+@pytest.mark.parametrize('url', [
+    '/canteens/spam',
+    '/canteens/spam/meta',
+    '/canteens/spam/menu'])
 def test_canteen_not_found(client, url):
     response = client.get(url)
     assert response.status_code == 404
@@ -56,8 +59,8 @@ def _request_check_meals(client):
     response = client.get('/canteens/griebnitzsee/menu')
 
     assert response.status_code == 200
-    meals = meal_names(response.data)
-    assert meals[0] == u"Gefüllter Germknödel \nmit Vanillesauce und Mohnzucker"
+    meal = meal_names(response.data)[0]
+    assert meal == u"Gefüllter Germknödel \nmit Vanillesauce und Mohnzucker"
 
 
 @pytest.fixture