Remove py26 format literals

Resolves #403

pre_commit/commands/autoupdate.py

@@ -61,7 +61,7 @@ def _update_repository(repo_config, runner):
     if hooks_missing:
         raise RepositoryCannotBeUpdatedError(
             'Cannot update because the tip of master is missing these hooks:\n'
-            '{0}'.format(', '.join(sorted(hooks_missing)))
+            '{}'.format(', '.join(sorted(hooks_missing)))
         )
 
     return new_config
@@ -86,7 +86,7 @@ def autoupdate(runner):
         if is_local_hooks(repo_config):
             output_configs.append(repo_config)
             continue
-        sys.stdout.write('Updating {0}...'.format(repo_config['repo']))
+        sys.stdout.write('Updating {}...'.format(repo_config['repo']))
         sys.stdout.flush()
         try:
             new_repo_config = _update_repository(repo_config, runner)
@@ -99,7 +99,7 @@ def autoupdate(runner):
         if new_repo_config['sha'] != repo_config['sha']:
             changed = True
             print(
-                'updating {0} -> {1}.'.format(
+                'updating {} -> {}.'.format(
                     repo_config['sha'], new_repo_config['sha'],
                 )
             )

pre_commit/commands/clean.py

@@ -9,5 +9,5 @@ from pre_commit.util import rmtree
 def clean(runner):
     if os.path.exists(runner.store.directory):
         rmtree(runner.store.directory)
-        print('Cleaned {0}.'.format(runner.store.directory))
+        print('Cleaned {}.'.format(runner.store.directory))
     return 0

pre_commit/commands/install_uninstall.py

@@ -62,7 +62,7 @@ def install(runner, overwrite=False, hooks=False, hook_type='pre-commit'):
         os.remove(legacy_path)
     elif os.path.exists(legacy_path):
         print(
-            'Running in migration mode with existing hooks at {0}\n'
+            'Running in migration mode with existing hooks at {}\n'
             'Use -f to use only pre-commit.'.format(
                 legacy_path,
             )
@@ -83,7 +83,7 @@ def install(runner, overwrite=False, hooks=False, hook_type='pre-commit'):
         pre_commit_file_obj.write(contents)
     make_executable(hook_path)
 
-    print('pre-commit installed at {0}'.format(hook_path))
+    print('pre-commit installed at {}'.format(hook_path))
 
     # If they requested we install all of the hooks, do so.
     if hooks:
@@ -110,10 +110,10 @@ def uninstall(runner, hook_type='pre-commit'):
         return 0
 
     os.remove(hook_path)
-    print('{0} uninstalled'.format(hook_type))
+    print('{} uninstalled'.format(hook_type))
 
     if os.path.exists(legacy_path):
         os.rename(legacy_path, hook_path)
-        print('Restored previous hooks to {0}'.format(hook_path))
+        print('Restored previous hooks to {}'.format(hook_path))
 
     return 0

pre_commit/commands/run.py

@@ -24,8 +24,8 @@ def _get_skips(environ):
 
 
 def _hook_msg_start(hook, verbose):
-    return '{0}{1}'.format(
-        '[{0}] '.format(hook['id']) if verbose else '',
+    return '{}{}'.format(
+        '[{}] '.format(hook['id']) if verbose else '',
         hook['name'],
     )
 
@@ -51,7 +51,7 @@ def _print_user_skipped(hook, write, args):
 
 def get_changed_files(new, old):
     return cmd_output(
-        'git', 'diff', '--name-only', '{0}...{1}'.format(old, new),
+        'git', 'diff', '--name-only', '{}...{}'.format(old, new),
     )[1].splitlines()
 
 
@@ -107,7 +107,7 @@ def _run_single_hook(hook, repo, args, write, skips=frozenset()):
     write(color.format_color(pass_fail, print_color, args.color) + '\n')
 
     if (stdout or stderr or file_modifications) and (retcode or args.verbose):
-        write('hookid: {0}\n'.format(hook['id']))
+        write('hookid: {}\n'.format(hook['id']))
         write('\n')
 
         # Print a message if failing due to file modifications
@@ -200,7 +200,7 @@ def run(runner, args, write=sys_stdout_write_wrapper, environ=os.environ):
                 if hook['id'] == args.hook
             ]
             if not repo_hooks:
-                write('No hook with id `{0}`\n'.format(args.hook))
+                write('No hook with id `{}`\n'.format(args.hook))
                 return 1
 
         # Filter hooks for stages