api: migrate to python3 only [reland]
Convert all the API modules to require Python 3.6. These only get
imported by two programs, and we've migrated those to Python 3.6.
We omit chromite.api.gen for now because that is widely imported
by other programs that still support Python 2.
We fixed the breakage in the service layer so we can reland this.
BUG=chromium:997354, chromium:1052524
TEST=`./run_tests` passes
Change-Id: Ia0bdfd8740bd82f3b16ed8955ac0c4e3e8128bf2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2058045
Reviewed-by: Alex Klein <saklein@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/api/validate.py b/api/validate.py
index 8339597..c27a562 100644
--- a/api/validate.py
+++ b/api/validate.py
@@ -15,6 +15,7 @@
import functools
import os
+import sys
from google.protobuf import message as protobuf_message
@@ -22,6 +23,9 @@
from chromite.lib import cros_logging as logging
+assert sys.version_info >= (3, 6), 'This module requires Python 3.6+'
+
+
def _value(field, message):
"""Helper function to fetch the value of the field.