Add support for 3.6 pipelines

This allows pipelines to be made for projects using python 3.6. This
can be done because CodeBuild recently added a 3.6.5 container.

CHANGELOG.rst

@@ -2,6 +2,13 @@
 CHANGELOG
 =========
 
+Next Release (TBD)
+==================
+
+* Add support for generating python 3.6 pipelines
+  (`#858 <https://github.com/aws/chalice/pull/858>`)
+
+
 1.3.0
 =====
 

chalice/pipeline.py

@@ -40,6 +40,7 @@ class CreatePipelineTemplate(object):
 
     _CODEBUILD_IMAGE = {
         'python2.7': 'python:2.7.12',
+        'python3.6': 'python:3.6.5',
     }
 
     _BASE_TEMPLATE = {

tests/unit/test_pipeline.py

@@ -41,11 +41,16 @@ def test_python_version_in_param_default(self):
         assert template['Parameters']['CodeBuildImage']['Default'] == \
             'aws/codebuild/python:2.7.12'
 
-    def test_py3_throws_error(self):
+    def test_python_36_in_param_default(self):
+        template = self.generate_template(lambda_python_version='python3.6')
+        assert template['Parameters']['CodeBuildImage']['Default'] == \
+            'aws/codebuild/python:3.6.5'
+
+    def test_invalid_python_throws_error(self):
         # This test can be removed when there is a 3.6 codebuild image
         # available.
         with pytest.raises(InvalidCodeBuildPythonVersion):
-            self.generate_template('app', 'python3.6')
+            self.generate_template('app', 'python2.6')
 
     def test_nonsense_py_version_throws_error(self):
         with pytest.raises(InvalidCodeBuildPythonVersion):