Merge pull request #686 from bnbarham/fix-for-old-python

Author: shahmishal

build-script-helper.py

@@ -294,9 +294,10 @@ def add_common_args(parser: argparse.ArgumentParser) -> None:
 
 def parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser(prog="build-script-helper.py")
-    subparsers = parser.add_subparsers(
-        title="subcommands", dest="action", required=True, metavar="action"
-    )
+    if sys.version_info >= (3, 7, 0):
+        subparsers = parser.add_subparsers(title="subcommands", dest="action", required=True, metavar="action")
+    else:
+        subparsers = parser.add_subparsers(title="subcommands", dest="action", metavar="action")
 
     build_parser = subparsers.add_parser("build", help="build the package")
     add_common_args(build_parser)