Run python linting on the file if running doctests

utils/python_lint.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+# python_lint.py - Runs flake8 linting over the repository ------*- python -*-
+#
+# This source file is part of the Swift.org open source project
+#
+# Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
+# Licensed under Apache License v2.0 with Runtime Library Exception
+#
+# See https://swift.org/LICENSE.txt for license information
+# See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+#
+
+from __future__ import print_function
+
+import os
+import subprocess
+import sys
+
+
+def lint(arguments, verbose=True):
+    flake8_result = subprocess.call(
+        [sys.executable, "-c", "import flake8; import flake8_import_order"]
+    )
+    if flake8_result != 0:
+        if verbose:
+            print("Missing modules flake8 or flake8-import-order. Please be"
+                  " sure to install these python packages before linting.")
+        return 0
+
+    utils_directory = os.path.dirname(os.path.abspath(__file__))
+    parent_directory = os.path.dirname(utils_directory)
+    linting_result = subprocess.call(
+        [sys.executable, "-m", "flake8"] + arguments,
+        cwd=parent_directory,
+        universal_newlines=True
+    )
+    return linting_result
+
+
+if __name__ == '__main__':
+    linting_result = lint(sys.argv[1:])
+    sys.exit(linting_result)