Tests: pathlib used where appropriate

Also fixed various pylint errors and style issues.

test/python/body_generate/wsgi.py

@@ -1,6 +1,6 @@
 def application(env, start_response):
     length = env.get('HTTP_X_LENGTH', '10')
-    bytes = b'X' * int(length)
+    body = b'X' * int(length)
 
     start_response('200', [('Content-Length', length)])
-    return [bytes]
+    return [body]

test/python/delayed/asgi.py

@@ -33,7 +33,9 @@ async def application(scope, receive, send):
         {
             'type': 'http.response.start',
             'status': 200,
-            'headers': [(b'content-length', str(len(body)).encode()),],
+            'headers': [
+                (b'content-length', str(len(body)).encode()),
+            ],
         }
     )
 

test/python/environment/wsgi.py

@@ -2,9 +2,11 @@ import os
 
 
 def application(env, start_response):
-    vars = env.get('HTTP_X_VARIABLES').split(',')
+    variables = env.get('HTTP_X_VARIABLES').split(',')
 
-    body = ','.join([str(os.environ[var]) for var in vars if var in os.environ])
+    body = ','.join(
+        [str(os.environ[var]) for var in variables if var in os.environ]
+    )
     body = body.encode()
 
     start_response('200', [('Content-Length', str(len(body)))])

test/python/iter_exception/wsgi.py

@@ -8,9 +8,7 @@ class application:
     def __iter__(self):
         self.__i = 0
         self._skip_level = int(self.environ.get('HTTP_X_SKIP', 0))
-        self._not_skip_close = int(
-            self.environ.get('HTTP_X_NOT_SKIP_CLOSE', 0)
-        )
+        self._not_skip_close = int(self.environ.get('HTTP_X_NOT_SKIP_CLOSE', 0))
         self._is_chunked = self.environ.get('HTTP_X_CHUNKED')
 
         headers = [(('Content-Length', '10'))]

test/python/legacy/asgi.py

@@ -9,6 +9,8 @@ async def app_http(receive, send):
         {
             'type': 'http.response.start',
             'status': 200,
-            'headers': [(b'content-length', b'0'),],
+            'headers': [
+                (b'content-length', b'0'),
+            ],
         }
     )

test/python/legacy_force/asgi.py

@@ -1,11 +1,10 @@
 def application(scope, receive=None, send=None):
     assert scope['type'] == 'http'
 
-    if receive == None and send == None:
+    if receive is None and send is None:
         return app_http
 
-    else:
-        return app_http(receive, send)
+    return app_http(receive, send)
 
 
 async def app_http(receive, send):
@@ -13,6 +12,8 @@ async def app_http(receive, send):
         {
             'type': 'http.response.start',
             'status': 200,
-            'headers': [(b'content-length', b'0'),],
+            'headers': [
+                (b'content-length', b'0'),
+            ],
         }
     )

test/python/lifespan/empty/asgi.py

@@ -3,7 +3,7 @@ import os
 
 async def handler(prefix, scope, receive, send):
     if scope['type'] == 'lifespan':
-        with open(f'{prefix}version', 'w+') as f:
+        with open(f'{prefix}version', 'w+', encoding='utf-8') as f:
             f.write(
                 f"{scope['asgi']['version']} {scope['asgi']['spec_version']}"
             )

test/python/lifespan/failed/asgi.py

@@ -6,6 +6,6 @@ async def application(scope, receive, send):
                 await send({"type": "lifespan.startup.failed"})
                 raise Exception('Exception blah')
 
-            elif message['type'] == 'lifespan.shutdown':
+            if message['type'] == 'lifespan.shutdown':
                 await send({'type': 'lifespan.shutdown.complete'})
                 return

test/python/restart/longstart.py

@@ -3,6 +3,7 @@ import time
 
 time.sleep(2)
 
+
 def application(environ, start_response):
     body = str(os.getpid()).encode()
 

test/python/unicode/wsgi.py

@@ -1,7 +1,7 @@
 def application(environ, start_response):
     temp_dir = environ.get('HTTP_TEMP_DIR')
 
-    with open(f'{temp_dir}/tempfile', 'w') as f:
+    with open(f'{temp_dir}/tempfile', 'w', encoding='utf-8') as f:
         f.write('\u26a0\ufe0f')
 
     start_response('200', [('Content-Length', '0')])

test/python/user_group/wsgi.py

@@ -6,7 +6,12 @@ def application(environ, start_response):
     uid = os.geteuid()
     gid = os.getegid()
 
-    out = json.dumps({'UID': uid, 'GID': gid,}).encode('utf-8')
+    out = json.dumps(
+        {
+            'UID': uid,
+            'GID': gid,
+        }
+    ).encode('utf-8')
 
     start_response(
         '200 OK',