Add python type annotations

Also use consistent quote symbols
Also use 'is None' instead of '== None'
Also use 'if list1' instead of 'if len(list1) > 0'

1 files changed, 14 insertions, 13 deletions

diff --git a/backend/server.py b/backend/server.py
index 48d6c3f..5b0d26b 100755
--- a/backend/server.py
+++ b/backend/server.py
@@ -1,6 +1,7 @@
 #!/usr/bin/python3
 
-import sys, os
+from typing import Iterable
+import os
 from wsgiref import simple_server, util
 import mimetypes
 from tilo import application
@@ -11,26 +12,26 @@ Runs a basic dev server that serves a WSGI script and image files
 """)
 parser.parse_args()
 
-# WSGI handler that uses 'application', but also serves image files
-def wrappingApp(environ, start_response):
-	urlPath = environ["PATH_INFO"]
-	if urlPath.startswith("/data/"):
+def wrappingApp(environ: dict[str, str], start_response) -> Iterable[bytes]:
+	""" WSGI handler that uses 'application', but also serves image files """
+	urlPath = environ['PATH_INFO']
+	if urlPath.startswith('/data/'):
 		# Run WSGI script
 		return application(environ, start_response)
-	elif urlPath.startswith("/tolData/img/"):
+	elif urlPath.startswith('/tolData/img/'):
 		# Serve image file
 		imgPath = os.path.join(os.getcwd(), urlPath[1:])
 		if os.path.exists(imgPath):
 			imgType = mimetypes.guess_type(imgPath)[0]
-			start_response("200 OK", [("Content-type", imgType)])
-			return util.FileWrapper(open(imgPath, "rb"))
+			start_response('200 OK', [('Content-type', imgType)])
+			return util.FileWrapper(open(imgPath, 'rb'))
 		else:
-			start_response("404 Not Found", [("Content-type", "text/plain")])
-			return [b"No image found"]
+			start_response('404 Not Found', [('Content-type', 'text/plain')])
+			return [b'No image found']
 	else:
-		start_response("404 Not Found", [("Content-type", "text/plain")])
-		return [b"Unrecognised path"]
+		start_response('404 Not Found', [('Content-type', 'text/plain')])
+		return [b'Unrecognised path']
 # Start server
 with simple_server.make_server('', 8000, wrappingApp) as httpd:
-    print("Serving HTTP on port 8000...")
+    print('Serving HTTP on port 8000...')
     httpd.serve_forever()