Support python3.9

.travis.yml

@@ -3,13 +3,14 @@ python:
   - "3.6"
   - "3.7"
   - "3.8"
+  - "3.9"
 env:
   - IMAGE_REPO=vyahello/pep8-checker IMAGE_VERSION=0.0.2
 addons:
   apt:
     update: true
 install:
-  - pip install pip -U
+  - pip install pip==20.2.0
   - pip install -r requirements.txt -U
   - pip install -r requirements-dev.txt -U
 script:

README.md

@@ -25,7 +25,7 @@
 
 ### Production
 
-- python 3.6, 3.7, 3.8
+- python 3.6, 3.7, 3.8, 3.9
 - [bottle](https://bottlepy.org/docs/dev/tutorial.html)
 - [AWS lambda](https://aws.amazon.com/)
 - [travis](https://travis-ci.org/) CI

checker/remote.py

@@ -1,15 +1,15 @@
 """Represents executable entrypoint for AWS lambda function."""
 from contextlib import redirect_stdout
 from io import StringIO
-from tempfile import NamedTemporaryFile as temp_file
+from tempfile import NamedTemporaryFile
 from typing import Any, Dict
 import pycodestyle
 
 
 def lambda_handler(event: Dict[str, Any]) -> Dict[str, Any]:
     """Returns response from AWS lambda execution."""
     code: str = event.get('code', '')
-    with open(temp_file(dir='/tmp').name, 'w') as file:
+    with open(NamedTemporaryFile(dir='/tmp').name, 'w') as file:
         file.write(f'{code}\n')
         file.seek(0)
         output = StringIO()