diff --git a/pre_commit_hooks/check_ast.py b/pre_commit_hooks/check_ast.py
index 0df3540..cb33ea0 100644
--- a/pre_commit_hooks/check_ast.py
+++ b/pre_commit_hooks/check_ast.py
@@ -23,14 +23,15 @@
             with open(filename, 'rb') as f:
                 ast.parse(f.read(), filename=filename)
         except SyntaxError:
-            print('{}: failed parsing with {} {}:'.format(
-                filename,
-                platform.python_implementation(),
-                sys.version.partition(' ')[0],
-            ))
-            print('\n{}'.format(
-                '    ' + traceback.format_exc().replace('\n', '\n    '),
-            ))
+            print(
+                '{}: failed parsing with {} {}:'.format(
+                    filename,
+                    platform.python_implementation(),
+                    sys.version.partition(' ')[0],
+                ),
+            )
+            tb = '    ' + traceback.format_exc().replace('\n', '\n    ')
+            print('\n{}'.format(tb))
             retval = 1
     return retval
 
diff --git a/pre_commit_hooks/check_merge_conflict.py b/pre_commit_hooks/check_merge_conflict.py
index 74e4ae1..2a03c3a 100644
--- a/pre_commit_hooks/check_merge_conflict.py
+++ b/pre_commit_hooks/check_merge_conflict.py
@@ -41,9 +41,11 @@
             for i, line in enumerate(inputfile):
                 for pattern in CONFLICT_PATTERNS:
                     if line.startswith(pattern):
-                        print(WARNING_MSG.format(
-                            pattern.decode(), filename, i + 1,
-                        ))
+                        print(
+                            WARNING_MSG.format(
+                                pattern.decode(), filename, i + 1,
+                            ),
+                        )
                         retcode = 1
 
     return retcode
diff --git a/pre_commit_hooks/fix_encoding_pragma.py b/pre_commit_hooks/fix_encoding_pragma.py
index 23fc79f..31bb52c 100644
--- a/pre_commit_hooks/fix_encoding_pragma.py
+++ b/pre_commit_hooks/fix_encoding_pragma.py
@@ -25,9 +25,11 @@
     )
 
 
-class ExpectedContents(collections.namedtuple(
-        'ExpectedContents', ('shebang', 'rest', 'pragma_status', 'ending'),
-)):
+class ExpectedContents(
+        collections.namedtuple(
+            'ExpectedContents', ('shebang', 'rest', 'pragma_status', 'ending'),
+        ),
+):
     """
     pragma_status:
     - True: has exactly the coding pragma expected
@@ -138,9 +140,11 @@
             )
             retv |= file_ret
             if file_ret:
-                print(fmt.format(
-                    pragma=args.pragma.decode(), filename=filename,
-                ))
+                print(
+                    fmt.format(
+                        pragma=args.pragma.decode(), filename=filename,
+                    ),
+                )
 
     return retv
 
diff --git a/pre_commit_hooks/string_fixer.py b/pre_commit_hooks/string_fixer.py
index a41b737..813ef64 100644
--- a/pre_commit_hooks/string_fixer.py
+++ b/pre_commit_hooks/string_fixer.py
@@ -45,9 +45,8 @@
     splitcontents = list(contents)
 
     # Iterate in reverse so the offsets are always correct
-    tokens = reversed(list(tokenize.generate_tokens(
-        io.StringIO(contents).readline,
-    )))
+    tokens_l = list(tokenize.generate_tokens(io.StringIO(contents).readline))
+    tokens = reversed(tokens_l)
     for token_type, token_text, (srow, scol), (erow, ecol), _ in tokens:
         if token_type == tokenize.STRING:
             new_text = handle_match(token_text)
diff --git a/pre_commit_hooks/util.py b/pre_commit_hooks/util.py
index d68e769..3b960e3 100644
--- a/pre_commit_hooks/util.py
+++ b/pre_commit_hooks/util.py
@@ -12,9 +12,8 @@
 
 
 def added_files():  # type: () -> Set[str]
-    return set(cmd_output(
-        'git', 'diff', '--staged', '--name-only', '--diff-filter=A',
-    ).splitlines())
+    cmd = ('git', 'diff', '--staged', '--name-only', '--diff-filter=A')
+    return set(cmd_output(*cmd).splitlines())
 
 
 def cmd_output(*cmd, **kwargs):  # type: (*str, **Any) -> str