add ortools and protobuf versions test to python examples archive

tools/check_python_deps.py

@@ -0,0 +1,69 @@
+import sys
+from six import print_
+import inspect
+from sys import executable
+
+current_ortools_version = "VVVV"
+minimum_protobuf_version = "PROTOBUF_TAG"
+print_ ("Python path : " + sys.executable)
+print_ ("Python version : " + sys.version + "\n")
+
+def notinstalled(modulename):
+	return modulename + """ is not installed for \"""" + sys.executable + """\"
+Please run \"easy_install --user """ + modulename + """\""""
+
+def wrong_version(module, modulename, required_version):
+	return """
+You're using an old version of """ + modulename + """ : """ + inspect.getfile(module) + """
+The minimum required version is : """ + required_version + """
+Please run \"""" + str(sys.executable) + """ setup.py install --user\" to upgrade
+If the problem persits, then """ + inspect.getfile(module) + """ is binding the newely installed version of """ + modulename + """
+You should either remove it, or use PYTHONPATH to manage your sys.path. If you decide to use PYTHONPATH, please do it to run the ortools examples as well.
+Please check https://docs.python.org/3/tutorial/modules.html#the-module-search-path from more information."""
+
+
+#try to import setuptools
+try:
+    from setuptools import setup, Extension
+    from setuptools.command import easy_install
+except ImportError:
+    raise ImportError("""setuptools is not installed for \"""" + sys.executable + """\"
+Please follow this link for installing instructions :
+https://pypi.python.org/pypi/setuptools
+make sure you use \"""" + sys.executable + """\" during the installation""")
+    raise SystemExit
+
+#try to import ortools
+try:
+	import ortools
+except ImportError:
+    print_ (notinstalled("ortools"))
+    raise SystemExit
+
+#try to import protobuf
+try:
+	import google.protobuf
+except ImportError:
+    print_ (notinstalled("protobuf"))
+    raise SystemExit
+
+#check ortools version
+try:
+	if current_ortools_version > ortools.__version__:
+		raise Exception
+	print_ ("or-tools version : " + ortools.__version__)
+	print_ (inspect.getfile(ortools) + "\n")
+except (AttributeError, Exception):
+	print_ (wrong_version(ortools, "ortools", current_ortools_version))
+	raise SystemExit
+
+#check protobuf version
+#print_(cmp(minimum_protobuf_version, google.protobuf.__version__) + "\n")
+try:
+	if minimum_protobuf_version > google.protobuf.__version__:
+		raise Exception
+	print_ ("protobuf version : " + google.protobuf.__version__)
+	print_ (inspect.getfile(google.protobuf) + "\n")
+except (AttributeError, Exception):
+	print_ (wrong_version(google.protobuf, "protobuf", minimum_protobuf_version))
+	raise SystemExit