diff --git a/examples/flask/app.py b/examples/flask/app.py
index 6e45a56..eeb532c 100644
--- a/examples/flask/app.py
+++ b/examples/flask/app.py
@@ -14,16 +14,11 @@ def is_authenticated(self):
         return True
 
     def make_user_key(self, username):
-        return 'user_{}'.format(username)
+        return f'user_{username}'
 
     def list(self):
         usernames = self.conn.lrange('users', 0, 100)
-        users = []
-
-        for user in usernames:
-            users.append(self.conn.hgetall(self.make_user_key(user)))
-
-        return users
+        return [self.conn.hgetall(self.make_user_key(user)) for user in usernames]
 
     def detail(self, username):
         return self.conn.hgetall(self.make_user_key(username))
diff --git a/examples/pyramid/app.py b/examples/pyramid/app.py
index 7d4ef1c..10dcde8 100644
--- a/examples/pyramid/app.py
+++ b/examples/pyramid/app.py
@@ -14,16 +14,11 @@ def is_authenticated(self):
         return True
 
     def make_user_key(self, username):
-        return 'user_{}'.format(username)
+        return f'user_{username}'
 
     def list(self):
         usernames = self.conn.lrange('users', 0, 100)
-        users = []
-
-        for user in usernames:
-            users.append(self.conn.hgetall(self.make_user_key(user)))
-
-        return users
+        return [self.conn.hgetall(self.make_user_key(user)) for user in usernames]
 
     def detail(self, username):
         return self.conn.hgetall(self.make_user_key(username))
diff --git a/restless/dj.py b/restless/dj.py
index 2d7a0fc..4f346dc 100644
--- a/restless/dj.py
+++ b/restless/dj.py
@@ -1,7 +1,7 @@
 import six
 
 from django.conf import settings
-from django.conf.urls import url
+from django.urls import re_path
 from django.core.exceptions import ObjectDoesNotExist
 from django.core.paginator import Paginator
 from django.http import HttpResponse, Http404
@@ -60,24 +60,19 @@ def wrap_list_response(self, data):
 
     # Because Django.
     @classmethod
-    def as_list(self, *args, **kwargs):
-        return csrf_exempt(super(DjangoResource, self).as_list(*args, **kwargs))
+    def as_list(cls, *args, **kwargs):
+        return csrf_exempt(super(DjangoResource, cls).as_list(*args, **kwargs))
 
     @classmethod
-    def as_detail(self, *args, **kwargs):
-        return csrf_exempt(super(DjangoResource, self).as_detail(*args, **kwargs))
+    def as_detail(cls, *args, **kwargs):
+        return csrf_exempt(super(DjangoResource, cls).as_detail(*args, **kwargs))
 
     def is_debug(self):
         return settings.DEBUG
 
     def build_response(self, data, status=OK):
-        if status == NO_CONTENT:
-            # Avoid crashing the client when it tries to parse nonexisting JSON.
-            content_type = 'text/plain'
-        else:
-            content_type = 'application/json'
-        resp = HttpResponse(data, content_type=content_type, status=status)
-        return resp
+        content_type = 'text/plain' if status == NO_CONTENT else 'application/json'
+        return HttpResponse(data, content_type=content_type, status=status)
 
     def build_error(self, err):
         # A bit nicer behavior surrounding things that don't exist.
@@ -105,9 +100,7 @@ def build_url_name(cls, name, name_prefix=None):
         :rtype: string
         """
         if name_prefix is None:
-            name_prefix = 'api_{}'.format(
-                cls.__name__.replace('Resource', '').lower()
-            )
+            name_prefix = f"api_{cls.__name__.replace('Resource', '').lower()}"
 
         name_prefix = name_prefix.rstrip('_')
         return '_'.join([name_prefix, name])
@@ -128,6 +121,6 @@ def urls(cls, name_prefix=None):
         :returns: A list of ``url`` objects for ``include(...)``
         """
         return [
-            url(r'^$', cls.as_list(), name=cls.build_url_name('list', name_prefix)),
-            url(r'^(?P<pk>[\w-]+)/$', cls.as_detail(), name=cls.build_url_name('detail', name_prefix)),
+            re_path(r'^$', cls.as_list(), name=cls.build_url_name('list', name_prefix)),
+            re_path(r'^(?P<pk>[\w-]+)/$', cls.as_detail(), name=cls.build_url_name('detail', name_prefix)),
         ]
diff --git a/restless/fl.py b/restless/fl.py
index a41a7d6..91b5650 100644
--- a/restless/fl.py
+++ b/restless/fl.py
@@ -46,11 +46,7 @@ def is_debug(self):
         return current_app.debug
 
     def build_response(self, data, status=OK):
-        if status == NO_CONTENT:
-            # Avoid crashing the client when it tries to parse nonexisting JSON.
-            content_type = 'text/plain'
-        else:
-            content_type = 'application/json'
+        content_type = 'text/plain' if status == NO_CONTENT else 'application/json'
         return make_response(data, status, {
             'Content-Type': content_type,
         })
@@ -74,9 +70,7 @@ def build_endpoint_name(cls, name, endpoint_prefix=None):
         :rtype: string
         """
         if endpoint_prefix is None:
-            endpoint_prefix = 'api_{}'.format(
-                cls.__name__.replace('Resource', '').lower()
-            )
+            endpoint_prefix = f"api_{cls.__name__.replace('Resource', '').lower()}"
 
         endpoint_prefix = endpoint_prefix.rstrip('_')
         return '_'.join([endpoint_prefix, name])
@@ -111,8 +105,8 @@ def add_url_rules(cls, app, rule_prefix, endpoint_prefix=None):
             methods=methods
         )
         app.add_url_rule(
-            rule_prefix + '<pk>/',
+            f'{rule_prefix}<pk>/',
             endpoint=cls.build_endpoint_name('detail', endpoint_prefix),
             view_func=cls.as_detail(),
-            methods=methods
+            methods=methods,
         )
diff --git a/restless/preparers.py b/restless/preparers.py
index 0515bc6..9d653a7 100644
--- a/restless/preparers.py
+++ b/restless/preparers.py
@@ -116,11 +116,7 @@ def lookup_data(self, lookup, data):
         if callable(value) and not hasattr(value, 'db_manager'):
             value = value()
 
-        if not remaining_lookup:
-            return value
-
-        # There's more to lookup, so dive in recursively.
-        return self.lookup_data(remaining_lookup, value)
+        return self.lookup_data(remaining_lookup, value) if remaining_lookup else value
 
 
 class SubPreparer(FieldsPreparer):
@@ -234,9 +230,4 @@ def prepare(self, data):
 
         Returns a list of data as the response.
         """
-        result = []
-
-        for item in self.get_inner_data(data):
-            result.append(self.preparer.prepare(item))
-
-        return result
+        return [self.preparer.prepare(item) for item in self.get_inner_data(data)]
diff --git a/restless/pyr.py b/restless/pyr.py
index c42e1d2..d4c51cc 100644
--- a/restless/pyr.py
+++ b/restless/pyr.py
@@ -29,13 +29,8 @@ def _wrapper(request):
         return _wrapper
 
     def build_response(self, data, status=OK):
-        if status == NO_CONTENT:
-            # Avoid crashing the client when it tries to parse nonexisting JSON.
-            content_type = 'text/plain'
-        else:
-            content_type = 'application/json'
-        resp = Response(data, status_code=status, content_type=content_type)
-        return resp
+        content_type = 'text/plain' if status == NO_CONTENT else 'application/json'
+        return Response(data, status_code=status, content_type=content_type)
 
     @classmethod
     def build_routename(cls, name, routename_prefix=None):
@@ -56,9 +51,7 @@ def build_routename(cls, name, routename_prefix=None):
         :rtype: string
         """
         if routename_prefix is None:
-            routename_prefix = 'api_{}'.format(
-                cls.__name__.replace('Resource', '').lower()
-            )
+            routename_prefix = f"api_{cls.__name__.replace('Resource', '').lower()}"
 
         routename_prefix = routename_prefix.rstrip('_')
         return '_'.join([routename_prefix, name])
diff --git a/restless/resources.py b/restless/resources.py
index 95a742a..e1ac675 100644
--- a/restless/resources.py
+++ b/restless/resources.py
@@ -270,14 +270,12 @@ def handle(self, endpoint, *args, **kwargs):
         try:
             # Use ``.get()`` so we can also dodge potentially incorrect
             # ``endpoint`` errors as well.
-            if not method in self.http_methods.get(endpoint, {}):
+            if method not in self.http_methods.get(endpoint, {}):
                 raise MethodNotImplemented(
-                    "Unsupported method '{}' for {} endpoint.".format(
-                        method,
-                        endpoint
-                    )
+                    f"Unsupported method '{method}' for {endpoint} endpoint."
                 )
 
+
             if not self.is_authenticated():
                 raise Unauthorized()
 
@@ -340,10 +338,7 @@ def deserialize_list(self, body):
 
         :returns: The deserialized body or an empty ``list``
         """
-        if body:
-            return self.serializer.deserialize(body)
-
-        return []
+        return self.serializer.deserialize(body) if body else []
 
     def deserialize_detail(self, body):
         """
@@ -354,10 +349,7 @@ def deserialize_detail(self, body):
 
         :returns: The deserialized body or an empty ``dict``
         """
-        if body:
-            return self.serializer.deserialize(body)
-
-        return {}
+        return self.serializer.deserialize(body) if body else {}
 
     def serialize(self, method, endpoint, data):
         """
@@ -402,10 +394,11 @@ def serialize_list(self, data):
 
         # Check for a ``Data``-like object. We should assume ``True`` (all
         # data gets prepared) unless it's explicitly marked as not.
-        if not getattr(data, 'should_prepare', True):
-            prepped_data = data.value
-        else:
-            prepped_data = [self.prepare(item) for item in data]
+        prepped_data = (
+            [self.prepare(item) for item in data]
+            if getattr(data, 'should_prepare', True)
+            else data.value
+        )
 
         final_data = self.wrap_list_response(prepped_data)
         return self.serializer.serialize(final_data)
@@ -425,10 +418,11 @@ def serialize_detail(self, data):
 
         # Check for a ``Data``-like object. We should assume ``True`` (all
         # data gets prepared) unless it's explicitly marked as not.
-        if not getattr(data, 'should_prepare', True):
-            prepped_data = data.value
-        else:
-            prepped_data = self.prepare(data)
+        prepped_data = (
+            self.prepare(data)
+            if getattr(data, 'should_prepare', True)
+            else data.value
+        )
 
         return self.serializer.serialize(prepped_data)
 
@@ -479,10 +473,7 @@ def is_authenticated(self):
         :returns: Whether the request is authenticated or not.
         :rtype: boolean
         """
-        if self.request_method() == 'GET':
-            return True
-
-        return False
+        return self.request_method() == 'GET'
 
     # Common methods the user should implement.
 
diff --git a/restless/tnd.py b/restless/tnd.py
index 6c6618a..acd3029 100644
--- a/restless/tnd.py
+++ b/restless/tnd.py
@@ -24,11 +24,7 @@
 
     from tornado.concurrent import Future
 
-    if futures is None:
-        FUTURES = Future
-    else:
-        FUTURES = (Future, futures.Future)
-
+    FUTURES = Future if futures is None else (Future, futures.Future)
     is_future = lambda x: isinstance(x, FUTURES)
 
 
@@ -100,22 +96,27 @@ def as_view(cls, view_type, *init_args, **init_kwargs):
         global _method
 
         new_cls = type(
-            cls.__name__ + '_' + _BridgeMixin.__name__ + '_restless',
-            (_BridgeMixin, cls._request_handler_base_,),
+            f'{cls.__name__}_{_BridgeMixin.__name__}_restless',
+            (
+                _BridgeMixin,
+                cls._request_handler_base_,
+            ),
             dict(
                 __resource_cls__=cls,
                 __resource_args__=init_args,
                 __resource_kwargs__=init_kwargs,
-                __resource_view_type__=view_type)
+                __resource_view_type__=view_type,
+            ),
         )
 
+
         """
         Add required http-methods to the newly created class
         We need to scan through MRO to find what functions users declared,
         and then add corresponding http-methods used by Tornado.
         """
         bases = inspect.getmro(cls)
-        bases = bases[0:bases.index(Resource)-1]
+        bases = bases[:bases.index(Resource)-1]
         for k, v in cls.http_methods[view_type].items():
             if any(v in base_cls.__dict__ for base_cls in bases):
                 setattr(new_cls, k.lower(), _method)
@@ -129,13 +130,8 @@ def request_body(self):
         return self.request.body 
 
     def build_response(self, data, status=OK):
-        if status == NO_CONTENT:
-            # Avoid crashing the client when it tries to parse nonexisting JSON.
-            content_type = 'text/plain'
-        else:
-            content_type = 'application/json'
-        self.ref_rh.set_header("Content-Type", "{}; charset=UTF-8"
-                               .format(content_type))
+        content_type = 'text/plain' if status == NO_CONTENT else 'application/json'
+        self.ref_rh.set_header("Content-Type", f"{content_type}; charset=UTF-8")
 
         self.ref_rh.set_status(status)
         self.ref_rh.finish(data)
@@ -152,14 +148,12 @@ def handle(self, endpoint, *args, **kwargs):
         method = self.request_method()
 
         try:
-            if not method in self.http_methods.get(endpoint, {}):
+            if method not in self.http_methods.get(endpoint, {}):
                 raise MethodNotImplemented(
-                    "Unsupported method '{}' for {} endpoint.".format(
-                        method,
-                        endpoint
-                    )
+                    f"Unsupported method '{method}' for {endpoint} endpoint."
                 )
 
+
             if not self.is_authenticated():
                 raise Unauthorized()
 
diff --git a/restless/utils.py b/restless/utils.py
index b8e3b4e..34f4250 100644
--- a/restless/utils.py
+++ b/restless/utils.py
@@ -22,7 +22,7 @@ class MoreTypesJSONEncoder(json.JSONEncoder):
     def default(self, data):
         if isinstance(data, (datetime.datetime, datetime.date, datetime.time)):
             return data.isoformat()
-        elif isinstance(data, decimal.Decimal) or isinstance(data, uuid.UUID):
+        elif isinstance(data, (decimal.Decimal, uuid.UUID)):
             return str(data)
         else:
             return super(MoreTypesJSONEncoder, self).default(data)
@@ -33,8 +33,7 @@ def format_traceback(exc_info):
     stack = stack[:-2]
     stack.extend(traceback.format_tb(exc_info[2]))
     stack.extend(traceback.format_exception_only(exc_info[0], exc_info[1]))
-    stack_str = "Traceback (most recent call last):\n"
-    stack_str += "".join(stack)
+    stack_str = "Traceback (most recent call last):\n" + "".join(stack)
     # Remove the last \n
     stack_str = stack_str[:-1]
     return stack_str
diff --git a/tests/test_dj.py b/tests/test_dj.py
index 520d712..643e8d2 100644
--- a/tests/test_dj.py
+++ b/tests/test_dj.py
@@ -66,10 +66,7 @@ def fake_init(self):
         ]
 
     def is_authenticated(self):
-        if self.request_method() == 'DELETE' and self.endpoint == 'list':
-            return False
-
-        return True
+        return self.request_method() != 'DELETE' or self.endpoint != 'list'
 
     def list(self):
         return self.fake_db
@@ -80,7 +77,7 @@ def detail(self, pk):
                 return item
 
         # If it wasn't found in our fake DB, raise a Django-esque exception.
-        raise ObjectDoesNotExist("Model with pk {} not found.".format(pk))
+        raise ObjectDoesNotExist(f"Model with pk {pk} not found.")
 
     def create(self):
         self.fake_db.append(FakeModel(
@@ -154,7 +151,7 @@ def detail(self, pk):
                 return item
 
         # If it wasn't found in our fake DB, raise a Django-esque exception.
-        raise Http404("Model with pk {} not found.".format(pk))
+        raise Http404(f"Model with pk {pk} not found.")
 
 
 @unittest.skipIf(not settings, "Django is not available")
diff --git a/tests/test_pyr.py b/tests/test_pyr.py
index d5abe19..64c02dd 100644
--- a/tests/test_pyr.py
+++ b/tests/test_pyr.py
@@ -35,10 +35,7 @@ def create(self):
         self.fake_db.append(self.data)
 
     def is_authenticated(self):
-        if self.request_method() == 'DELETE':
-            return False
-
-        return True
+        return self.request_method() != 'DELETE'
 
 
 @unittest.skipIf(not testing, 'Pyramid is not available')
diff --git a/tests/test_tnd.py b/tests/test_tnd.py
index f45f481..12b36fc 100644
--- a/tests/test_tnd.py
+++ b/tests/test_tnd.py
@@ -19,10 +19,10 @@ def _newer_or_equal_(v):
 
 
 def _equal_(v):
-    for i in six.moves.xrange(min(len(v), len(version_info))):
-        if v[i] != version_info[i]:
-            return False
-    return True
+    return all(
+        v[i] == version_info[i]
+        for i in six.moves.xrange(min(len(v), len(version_info)))
+    )
 
 try:
     from restless.tnd import TornadoResource, _BridgeMixin
@@ -73,10 +73,7 @@ def list(self):
         return self.fake_db
 
     def detail(self, pk):
-        for item in self.fake_db:
-            if item['id'] == pk:
-                return item
-        return None
+        return next((item for item in self.fake_db if item['id'] == pk), None)
 
     def create(self):
         self.fake_db.append(self.data)