Add support for Python 3.9

Author: manmartgarc

.gitignore

@@ -10,4 +10,4 @@ chalice.egg-info/
 .pytest_cache/
 .mypy_cache/
 *.pyc
-.vscode
+.vscode

chalice/config.py

@@ -163,7 +163,9 @@ def lambda_python_version(self):
             return 'python3.6'
         elif (major, minor) <= (3, 7):
             return 'python3.7'
-        return 'python3.8'
+        elif (major, minor) <= (3, 8):
+            return 'python3.8'
+        return 'python3.9'
 
     @property
     def layers(self):

chalice/deploy/packager.py

@@ -77,6 +77,7 @@ class BaseLambdaDeploymentPackager(object):
         'python3.6': 'cp36m',
         'python3.7': 'cp37m',
         'python3.8': 'cp38',
+        'python3.9': 'cp39'
     }
 
     def __init__(self, osutils, dependency_builder, ui):

tests/functional/cli/test_cli.py

@@ -413,6 +413,8 @@ def test_error_when_no_deployed_record(runner, mock_cli_factory):
                     reason="Cannot generate pipeline for python3.7.")
 @pytest.mark.skipif(sys.version_info[:2] == (3, 8),
                     reason="Cannot generate pipeline for python3.8.")
+@pytest.mark.skipif(sys.version_info[:2] == (3, 9),
+                    reason="Cannot generate pipeline for python3.9.")
 def test_can_generate_pipeline_for_all(runner):
     with runner.isolated_filesystem():
         newproj.create_new_project_skeleton('testproject')

tests/unit/test_config.py

@@ -373,8 +373,10 @@ def test_can_load_python_version():
         expected_runtime = 'python3.6'
     elif minor <= 7:
         expected_runtime = 'python3.7'
-    else:
+    elif minor <= 8:
         expected_runtime = 'python3.8'
+    else:
+        expected_runtime = 'python3.9'
     assert c.lambda_python_version == expected_runtime