Use asottile/add-trailing-comma

pre_commit/languages/docker.py

@@ -23,7 +23,7 @@ def md5(s):  # pragma: windows no cover
 
 def docker_tag(repo_cmd_runner):  # pragma: windows no cover
     return 'pre-commit-{}'.format(
-        md5(os.path.basename(repo_cmd_runner.path()))
+        md5(os.path.basename(repo_cmd_runner.path())),
     ).lower()
 
 
@@ -92,7 +92,7 @@ def run_hook(repo_cmd_runner, hook, file_args):  # pragma: windows no cover
         '-v', '{}:/src:rw'.format(os.getcwd()),
         '--workdir', '/src',
         '--entrypoint', entry_executable,
-        docker_tag(repo_cmd_runner)
+        docker_tag(repo_cmd_runner),
     ) + cmd_rest
 
     return xargs(cmd, file_args)

pre_commit/languages/python.py

@@ -107,7 +107,7 @@ def install_environment(repo_cmd_runner, version, additional_dependencies):
     with clean_path_on_failure(repo_cmd_runner.path(directory)):
         venv_cmd = [
             sys.executable, '-m', 'virtualenv',
-            '{{prefix}}{}'.format(directory)
+            '{{prefix}}{}'.format(directory),
         ]
         if version != 'default':
             venv_cmd.extend(['-p', norm_version(version)])

pre_commit/languages/ruby.py

@@ -81,7 +81,7 @@ def _install_rbenv(
             # directory
             "export GEM_HOME='{directory}/gems'\n"
             'export PATH="$GEM_HOME/bin:$PATH"\n'
-            '\n'.format(directory=repo_cmd_runner.path(directory))
+            '\n'.format(directory=repo_cmd_runner.path(directory)),
         )
 
         # If we aren't using the system ruby, add a version here