Switch black to py36 as the minimum version (#5608)

4 files changed, 8 insertions, 8 deletions

diff --git a/src/_cffi_src/utils.py b/src/_cffi_src/utils.py
index 56745a3e5..93659ffc3 100644
--- a/src/_cffi_src/utils.py
+++ b/src/_cffi_src/utils.py
@@ -16,7 +16,7 @@ from cffi import FFI
 base_src = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 about = {}
 with open(os.path.join(base_src, "cryptography", "__about__.py")) as f:
-    exec (f.read(), about)
+    exec(f.read(), about)
 
 
 def build_ffi_for_binding(
diff --git a/src/cryptography/hazmat/backends/openssl/backend.py b/src/cryptography/hazmat/backends/openssl/backend.py
index f61932877..976209f71 100644
--- a/src/cryptography/hazmat/backends/openssl/backend.py
+++ b/src/cryptography/hazmat/backends/openssl/backend.py
@@ -1167,7 +1167,7 @@ class Backend(object):
                 *[
                     encode_der(INTEGER, encode_der_integer(x.value))
                     for x in extension.value
-                ]
+                ],
             )
             value = _encode_asn1_str_gc(self, asn1)
             return self._create_raw_x509_extension(extension, value)
diff --git a/src/cryptography/hazmat/backends/openssl/decode_asn1.py b/src/cryptography/hazmat/backends/openssl/decode_asn1.py
index cc9b8c0e3..f29057e98 100644
--- a/src/cryptography/hazmat/backends/openssl/decode_asn1.py
+++ b/src/cryptography/hazmat/backends/openssl/decode_asn1.py
@@ -132,7 +132,7 @@ def _decode_general_name(backend, gn):
             if "1" in bits[prefix:]:
                 raise ValueError("Invalid netmask")
 
-            ip = ipaddress.ip_network(base.exploded + u"/{}".format(prefix))
+            ip = ipaddress.ip_network(base.exploded + "/{}".format(prefix))
         else:
             ip = ipaddress.ip_address(data)
 
diff --git a/src/cryptography/x509/extensions.py b/src/cryptography/x509/extensions.py
index 130ba69b8..d1981704e 100644
--- a/src/cryptography/x509/extensions.py
+++ b/src/cryptography/x509/extensions.py
@@ -671,9 +671,9 @@ class PolicyConstraints(object):
 
     def __repr__(self):
         return (
-            u"<PolicyConstraints(require_explicit_policy={0.require_explicit"
-            u"_policy}, inhibit_policy_mapping={0.inhibit_policy_"
-            u"mapping})>".format(self)
+            "<PolicyConstraints(require_explicit_policy={0.require_explicit"
+            "_policy}, inhibit_policy_mapping={0.inhibit_policy_"
+            "mapping})>".format(self)
         )
 
     def __eq__(self, other):
@@ -1180,8 +1180,8 @@ class NameConstraints(object):
 
     def __repr__(self):
         return (
-            u"<NameConstraints(permitted_subtrees={0.permitted_subtrees}, "
-            u"excluded_subtrees={0.excluded_subtrees})>".format(self)
+            "<NameConstraints(permitted_subtrees={0.permitted_subtrees}, "
+            "excluded_subtrees={0.excluded_subtrees})>".format(self)
         )
 
     def __hash__(self):