diff --git a/tests/unit/test_matchers.py b/tests/unit/test_matchers.py
index 5efc507..9889b4f 100644
--- a/tests/unit/test_matchers.py
+++ b/tests/unit/test_matchers.py
@@ -22,7 +22,7 @@ def assert_matcher(matcher_name):
     matcher = getattr(matchers, matcher_name)
     for k1, k2 in itertools.permutations(REQUESTS, 2):
         matched = matcher(REQUESTS[k1], REQUESTS[k2])
-        if matcher_name in set((k1, k2)):
+        if matcher_name in {k1, k2}:
             assert not matched
         else:
             assert matched
@@ -31,7 +31,7 @@ def assert_matcher(matcher_name):
 def test_uri_matcher():
     for k1, k2 in itertools.permutations(REQUESTS, 2):
         matched = matchers.uri(REQUESTS[k1], REQUESTS[k2])
-        if set((k1, k2)) != set(('base', 'method')):
+        if {k1, k2} != {'base', 'method'}:
             assert not matched
         else:
             assert matched
diff --git a/tests/unit/test_vcr.py b/tests/unit/test_vcr.py
index 3592ef0..5a6bb6e 100644
--- a/tests/unit/test_vcr.py
+++ b/tests/unit/test_vcr.py
@@ -319,11 +319,11 @@ def test_additional_matchers():
 
     @vcr.use_cassette
     def function_defaults(cassette):
-        assert set(cassette._match_on) == set([vcr.matchers['uri']])
+        assert set(cassette._match_on) == {vcr.matchers['uri']}
 
     @vcr.use_cassette(additional_matchers=('body',))
     def function_additional(cassette):
-        assert set(cassette._match_on) == set([vcr.matchers['uri'], vcr.matchers['body']])
+        assert set(cassette._match_on) == {vcr.matchers['uri'], vcr.matchers['body']}
 
     function_defaults()
     function_additional()
diff --git a/vcr/stubs/httplib2_stubs.py b/vcr/stubs/httplib2_stubs.py
index b08f357..4f31537 100644
--- a/vcr/stubs/httplib2_stubs.py
+++ b/vcr/stubs/httplib2_stubs.py
@@ -13,9 +13,7 @@ class VCRHTTPConnectionWithTimeout(VCRHTTPConnection,
         HTTPConnection.__init__.'''
 
         # Delete the keyword arguments that HTTPConnection would not recognize
-        safe_keys = set(
-            ('host', 'port', 'strict', 'timeout', 'source_address')
-        )
+        safe_keys = {'host', 'port', 'strict', 'timeout', 'source_address'}
         unknown_keys = set(kwargs.keys()) - safe_keys
         safe_kwargs = kwargs.copy()
         for kw in unknown_keys:
@@ -33,7 +31,7 @@ class VCRHTTPSConnectionWithTimeout(VCRHTTPSConnection,
     def __init__(self, *args, **kwargs):
 
         # Delete the keyword arguments that HTTPSConnection would not recognize
-        safe_keys = set((
+        safe_keys = {
             'host',
             'port',
             'key_file',
@@ -42,7 +40,7 @@ class VCRHTTPSConnectionWithTimeout(VCRHTTPSConnection,
             'timeout',
             'source_address',
             'ca_certs',
-        ))
+        }
         unknown_keys = set(kwargs.keys()) - safe_keys
         safe_kwargs = kwargs.copy()
         for kw in unknown_keys: