diff --git a/requests/adapters.py b/requests/adapters.py
index f26391502e..09d5eb8036 100644
--- a/requests/adapters.py
+++ b/requests/adapters.py
@@ -129,8 +129,7 @@ def __init__(self, pool_connections=DEFAULT_POOLSIZE,
         self.init_poolmanager(pool_connections, pool_maxsize, block=pool_block)
 
     def __getstate__(self):
-        return dict((attr, getattr(self, attr, None)) for attr in
-                    self.__attrs__)
+        return {attr: getattr(self, attr, None) for attr in self.__attrs__}
 
     def __setstate__(self, state):
         # Can't handle by adding 'proxy_manager' to self.__attrs__ because
diff --git a/requests/cookies.py b/requests/cookies.py
index 72e94be8d6..56fccd9c25 100644
--- a/requests/cookies.py
+++ b/requests/cookies.py
@@ -444,20 +444,21 @@ def create_cookie(name, value, **kwargs):
     By default, the pair of `name` and `value` will be set for the domain ''
     and sent on every request (this is sometimes called a "supercookie").
     """
-    result = dict(
-        version=0,
-        name=name,
-        value=value,
-        port=None,
-        domain='',
-        path='/',
-        secure=False,
-        expires=None,
-        discard=True,
-        comment=None,
-        comment_url=None,
-        rest={'HttpOnly': None},
-        rfc2109=False,)
+    result = {
+        'version': 0,
+        'name': name,
+        'value': value,
+        'port': None,
+        'domain': '',
+        'path': '/',
+        'secure': False,
+        'expires': None,
+        'discard': True,
+        'comment': None,
+        'comment_url': None,
+        'rest': {'HttpOnly': None},
+        'rfc2109': False,
+    }
 
     badargs = set(kwargs) - set(result)
     if badargs:
diff --git a/requests/hooks.py b/requests/hooks.py
index 32b32de750..7a51f212c8 100644
--- a/requests/hooks.py
+++ b/requests/hooks.py
@@ -15,14 +15,14 @@
 
 
 def default_hooks():
-    return dict((event, []) for event in HOOKS)
+    return {event: [] for event in HOOKS}
 
 # TODO: response is the only one
 
 
 def dispatch_hook(key, hooks, hook_data, **kwargs):
     """Dispatches a hook dictionary on a given piece of data."""
-    hooks = hooks or dict()
+    hooks = hooks or {}
     hooks = hooks.get(key)
     if hooks:
         if hasattr(hooks, '__call__'):
diff --git a/requests/models.py b/requests/models.py
index 4c8d631c7f..3dded57eff 100644
--- a/requests/models.py
+++ b/requests/models.py
@@ -652,10 +652,7 @@ def __getstate__(self):
         if not self._content_consumed:
             self.content
 
-        return dict(
-            (attr, getattr(self, attr, None))
-            for attr in self.__attrs__
-        )
+        return {attr: getattr(self, attr, None) for attr in self.__attrs__}
 
     def __setstate__(self, state):
         for name, value in state.items():
diff --git a/requests/sessions.py b/requests/sessions.py
index b124d793d1..a448bd83f2 100644
--- a/requests/sessions.py
+++ b/requests/sessions.py
@@ -738,7 +738,7 @@ def mount(self, prefix, adapter):
             self.adapters[key] = self.adapters.pop(key)
 
     def __getstate__(self):
-        state = dict((attr, getattr(self, attr, None)) for attr in self.__attrs__)
+        state = {attr: getattr(self, attr, None) for attr in self.__attrs__}
         return state
 
     def __setstate__(self, state):
diff --git a/tests/test_requests.py b/tests/test_requests.py
index b4ee9f94d4..d972f00263 100644
--- a/tests/test_requests.py
+++ b/tests/test_requests.py
@@ -864,7 +864,7 @@ def test_certificate_failure(self, httpbin_secure):
 
     def test_urlencoded_get_query_multivalued_param(self, httpbin):
 
-        r = requests.get(httpbin('get'), params=dict(test=['foo', 'baz']))
+        r = requests.get(httpbin('get'), params={'test': ['foo', 'baz']})
         assert r.status_code == 200
         assert r.url == httpbin('get?test=foo&test=baz')
 
diff --git a/tests/test_utils.py b/tests/test_utils.py
index f34c630f07..59b0b0efaf 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -665,7 +665,7 @@ def test_add_dict_to_cookiejar(cookiejar):
     cookiedict = {'test': 'cookies',
                   'good': 'cookies'}
     cj = add_dict_to_cookiejar(cookiejar, cookiedict)
-    cookies = dict((cookie.name, cookie.value) for cookie in cj)
+    cookies = {cookie.name: cookie.value for cookie in cj}
     assert cookiedict == cookies