Script to check Python version on CI

tools/check_python_version.py

@@ -0,0 +1,71 @@
+"""Check if the installed Python interpreter has correct version.
+
+This script has to be called with two command line arguments:
+expected_major_version expected_minor_version
+
+The script then check if actual Python version (major+minor) is
+the same or newer than expected version.
+
+Usage:
+python check_python_version.py 2.7
+python3 check_python_version.py 3.6
+python3 check_python_version.py 3.7
+etc.
+"""
+
+import sys
+
+
+def get_expected_version(arguments):
+    """Get the expected version from arguments provided on command line."""
+    if len(arguments) <= 2:
+        print("Usage python check_python_version.py major minor\n"
+              "      python3 check_python_version.py major minor")
+        raise Exception("CLI arguments missing")
+
+    # try to read major version
+    try:
+        major = int(arguments[1])
+    except Exception as e:
+        print("Can not parse major version '{}'".format(arguments[1]))
+        raise e
+
+    # try to read minor version
+    try:
+        minor = int(arguments[2])
+    except Exception as e:
+        print("Can not parse minor version '{}'".format(arguments[2]))
+        raise e
+
+    return (major, minor)
+
+
+def get_actual_version():
+    """Get the actual version of Python interpreter."""
+    return (sys.version_info.major, sys.version_info.minor)
+
+
+def compare_versions(actual, expected):
+    """Compare Python versions, return the exit code."""
+    if actual < expected:
+        print("Unsupported version {}.{}".format(actual[0], actual[1]))
+        return 1
+    else:
+        m = "OK: actual Python version {}.{} conforms to expected version {}.{}"
+        print(m.format(actual[0], actual[1], expected[0], expected[1]))
+        return 0
+
+
+def main():
+    """Entry to the Python version comparator."""
+    try:
+        actual = get_actual_version()
+        expected = get_expected_version(sys.argv)
+        exit_code = compare_versions(actual, expected)
+        sys.exit(exit_code)
+    except Exception:
+        sys.exit(2)
+
+
+if __name__ == "__main__":
+    main()