Add black, isort and flake8

Add .pre-commit-config.yaml to automatically test the files

.pre-commit-config.yaml

@@ -0,0 +1,19 @@
+repos:
+
+- repo: local
+  hooks:
+    - id: black
+      name: Black
+      entry: pipenv run black .
+      language: system
+      types: [python]
+    - id: isort
+      name: Isort
+      entry: pipenv run isort .
+      language: system
+      types: [python]
+    - id: flake8
+      name: Flake8
+      entry: pipenv run flake8
+      language: system
+      types: [python]

Pipfile

@@ -4,6 +4,9 @@ url = "https://pypi.org/simple"
 verify_ssl = true
 
 [dev-packages]
+black = "==19.10b0"
+flake8 = "*"
+isort = "*"
 
 [packages]
 "aiohttp[speedups]" = "*"

app.py

@@ -1,13 +1,13 @@
-import asyncio
 import io
 from urllib.parse import parse_qsl, urlparse
 
 import aiohttp
 from aiohttp import web
 from PIL import Image
-from validation import schema
 from voluptuous import MultipleInvalid
 
+from validation import schema
+
 
 def main(host, port):
     app = web.Application()
@@ -69,5 +69,5 @@ async def stream_from_image(img, request):
 HOST = "0.0.0.0"
 PORT = 8000
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main(HOST, PORT)

validation.py

@@ -2,20 +2,14 @@
 
 from voluptuous import Invalid, Schema
 
-resize_validator = re.compile(r'^([1-9]\d*)x([1-9]\d*)$')
+resize_validator = re.compile(r"^([1-9]\d*)x([1-9]\d*)$")
 
 
 def is_resize(s):
     result = resize_validator.match(s)
     if result is None:
-        raise Invalid('Invalid resize')
+        raise Invalid("Invalid resize")
     return [int(size) for size in result.groups()]
 
 
-schema = Schema(
-    {
-        'source': str,
-        'resize': is_resize,
-    },
-    required=True
-)
+schema = Schema({"source": str, "resize": is_resize}, required=True)