Merge pull request #38 from flywheel-io/python3

Support python3 in addition to python2

.circleci/config.yml

@@ -1,4 +1,16 @@
 version: 2
+workflows:
+  version: 2
+  build-workflow:
+    jobs:
+      - build:
+          filters:
+            tags:
+              only: /.*/
+      - test-python3:
+          filters:
+            tags:
+              only: /.*/
 
 jobs:
   build:
@@ -29,3 +41,30 @@ jobs:
       - run:
           name: Exchange litmus test
           command: .circleci/litmus-test.sh
+
+  test-python3:
+    docker:
+      - image: python:3-alpine3.7
+
+    steps:
+      - checkout
+
+      - restore_cache:
+          key: gears-1-{{ checksum "setup.py"}}
+
+      - run:
+          name: Install Dependencies
+          command: pip install -e .
+
+      - save_cache:
+          key: gears-1-{{ checksum "setup.py"}}
+          paths:
+              - "~/.cache/pip"
+
+      - run:
+          name: Validation suite
+          command: examples/test.py validation
+
+      - run:
+          name: Exchange litmus test
+          command: .circleci/litmus-test.sh

examples/test.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+from __future__ import print_function
 
 import argparse
 from os import sys, path, listdir, walk
@@ -51,19 +52,19 @@ def run_test_wrap(name, manifest, invocation, shouldpass):
 	try:
 		run_test(name, manifest, invocation)
 		if shouldpass:
-			print '[X]'
+			print('[X]')
 			return
 
 	except jsonschema.exceptions.ValidationError as ex:
 
 		if shouldpass:
-			print '[ ]'
+			print('[ ]')
 			raise ex
 		else:
-			print '[X]'
+			print('[X]')
 			return
 
-	print '[ ]'
+	print('[ ]')
 	raise Exception('Test should fail but did not: ' + name)
 
 def run_validation_suite(args):

gears/__init__.py

@@ -1 +1 @@
-from generator import *
+from .generator import *

gears/__main__.py

@@ -1,3 +1,4 @@
+from __future__ import print_function
 import argparse
 import json
 import sys
@@ -12,4 +13,4 @@
 
 manifest = generator.load_json_from_file(args.manifest)
 
-print json.dumps(generator.derive_invocation_schema(manifest))
+print(json.dumps(generator.derive_invocation_schema(manifest)))

spec/readme.md

@@ -1,4 +1,4 @@
-# Flywheel Gear Spec (v0.1.8)
+# Flywheel Gear Spec (v0.1.9)
 
 This document describes the structure of a Flywheel Gear.