Update super usage

notebook/base/handlers.py

@@ -301,7 +301,7 @@ def allow_credentials(self):
 
     def set_default_headers(self):
         """Add CORS headers, if defined"""
-        super(IPythonHandler, self).set_default_headers()
+        super().set_default_headers()
         if self.allow_origin:
             self.set_header("Access-Control-Allow-Origin", self.allow_origin)
         elif self.allow_origin_pat:
@@ -442,7 +442,7 @@ def check_xsrf_cookie(self):
             # Servers without authentication are vulnerable to XSRF
             return
         try:
-            return super(IPythonHandler, self).check_xsrf_cookie()
+            return super().check_xsrf_cookie()
         except web.HTTPError as e:
             if self.request.method in {'GET', 'HEAD'}:
                 # Consider Referer a sufficient cross-origin check for GET requests
@@ -496,7 +496,7 @@ def check_host(self):
     def prepare(self):
         if not self.check_host():
             raise web.HTTPError(403)
-        return super(IPythonHandler, self).prepare()
+        return super().prepare()
 
     #---------------------------------------------------------------
     # template rendering
@@ -591,7 +591,7 @@ class APIHandler(IPythonHandler):
     def prepare(self):
         if not self.check_origin():
             raise web.HTTPError(404)
-        return super(APIHandler, self).prepare()
+        return super().prepare()
 
     def write_error(self, status_code, **kwargs):
         """APIHandler errors are JSON, not human pages"""
@@ -618,7 +618,7 @@ def get_current_user(self):
         # preserve _user_cache so we don't raise more than once
         if hasattr(self, '_user_cache'):
             return self._user_cache
-        self._user_cache = user = super(APIHandler, self).get_current_user()
+        self._user_cache = user = super().get_current_user()
         return user
 
     def get_login_url(self):
@@ -627,12 +627,12 @@ def get_login_url(self):
         # instead of redirecting, raise 403 instead.
         if not self.current_user:
             raise web.HTTPError(403)
-        return super(APIHandler, self).get_login_url()
+        return super().get_login_url()
 
     @property
     def content_security_policy(self):
         csp = '; '.join([
-                super(APIHandler, self).content_security_policy,
+                super().content_security_policy,
                 "default-src 'none'",
             ])
         return csp
@@ -653,7 +653,7 @@ def update_api_activity(self):
     def finish(self, *args, **kwargs):
         self.update_api_activity()
         self.set_header('Content-Type', 'application/json')
-        return super(APIHandler, self).finish(*args, **kwargs)
+        return super().finish(*args, **kwargs)
 
     def options(self, *args, **kwargs):
         if 'Access-Control-Allow-Headers' in self.settings.get('headers', {}):
@@ -700,13 +700,12 @@ class AuthenticatedFileHandler(IPythonHandler, web.StaticFileHandler):
     def content_security_policy(self):
         # In case we're serving HTML/SVG, confine any Javascript to a unique
         # origin so it can't interact with the notebook server.
-        return super(AuthenticatedFileHandler, self).content_security_policy + \
-                "; sandbox allow-scripts"
+        return super().content_security_policy + "; sandbox allow-scripts"
 
     @web.authenticated
     def head(self, path):
         self.check_xsrf_cookie()
-        return super(AuthenticatedFileHandler, self).head(path)
+        return super().head(path)
 
     @web.authenticated
     def get(self, path):
@@ -731,10 +730,10 @@ def get_content_type(self):
             if cur_mime == 'text/plain':
                 return 'text/plain; charset=UTF-8'
             else:
-                return super(AuthenticatedFileHandler, self).get_content_type()
+                return super().get_content_type()
 
     def set_headers(self):
-        super(AuthenticatedFileHandler, self).set_headers()
+        super().set_headers()
         # disable browser caching, rely on 304 replies for savings
         if "v" not in self.request.arguments:
             self.add_header("Cache-Control", "no-cache")
@@ -749,7 +748,7 @@ def validate_absolute_path(self, root, absolute_path):
 
         Adding to tornado's own handling, forbids the serving of hidden files.
         """
-        abs_path = super(AuthenticatedFileHandler, self).validate_absolute_path(root, absolute_path)
+        abs_path = super().validate_absolute_path(root, absolute_path)
         abs_root = os.path.abspath(root)
         if is_hidden(abs_path, abs_root) and not self.contents_manager.allow_hidden:
             self.log.info("Refusing to serve hidden file, via 404 Error, use flag 'ContentsManager.allow_hidden' to enable")
@@ -795,7 +794,7 @@ class FileFindHandler(IPythonHandler, web.StaticFileHandler):
     _static_paths = {}
 
     def set_headers(self):
-        super(FileFindHandler, self).set_headers()
+        super().set_headers()
         # disable browser caching, rely on 304 replies for savings
         if "v" not in self.request.arguments or \
                 any(self.request.path.startswith(path) for path in self.no_cache_paths):
@@ -842,7 +841,7 @@ def validate_absolute_path(self, root, absolute_path):
             if (absolute_path + os.sep).startswith(root):
                 break
 
-        return super(FileFindHandler, self).validate_absolute_path(root, absolute_path)
+        return super().validate_absolute_path(root, absolute_path)
 
 
 class APIVersionHandler(APIHandler):

notebook/base/zmqhandlers.py

@@ -289,7 +289,7 @@ def get(self, *args, **kwargs):
         # assign and yield in two step to avoid tornado 3 issues
         res = self.pre_get()
         yield maybe_future(res)
-        res = super(AuthenticatedZMQStreamHandler, self).get(*args, **kwargs)
+        res = super().get(*args, **kwargs)
         yield maybe_future(res)
 
     def initialize(self):

notebook/bundler/bundlerextensions.py

@@ -294,7 +294,7 @@ class BundlerExtensionApp(BaseExtensionApp):
 
     def start(self):
         """Perform the App's functions as configured"""
-        super(BundlerExtensionApp, self).start()
+        super().start()
 
         # The above should have called a subcommand and raised NoStart; if we
         # get here, it didn't, so we should self.log.info a message.

notebook/files/handlers.py

@@ -26,8 +26,7 @@ class FilesHandler(IPythonHandler):
     def content_security_policy(self):
         # In case we're serving HTML/SVG, confine any Javascript to a unique
         # origin so it can't interact with the notebook server.
-        return super(FilesHandler, self).content_security_policy + \
-               "; sandbox allow-scripts"
+        return super().content_security_policy + "; sandbox allow-scripts"
 
     @web.authenticated
     def head(self, path):

notebook/gateway/handlers.py

@@ -68,7 +68,7 @@ def initialize(self):
     def get(self, kernel_id, *args, **kwargs):
         self.authenticate()
         self.kernel_id = cast_unicode(kernel_id, 'ascii')
-        yield super(WebSocketChannelsHandler, self).get(kernel_id=kernel_id, *args, **kwargs)
+        yield super().get(kernel_id=kernel_id, *args, **kwargs)
 
     def send_ping(self):
         if self.ws_connection is None and self.ping_callback is not None:
@@ -97,15 +97,15 @@ def write_message(self, message, binary=False):
         if self.ws_connection:  # prevent WebSocketClosedError
             if isinstance(message, bytes):
                 binary = True
-            super(WebSocketChannelsHandler, self).write_message(message, binary=binary)
+            super().write_message(message, binary=binary)
         elif self.log.isEnabledFor(logging.DEBUG):
             msg_summary = WebSocketChannelsHandler._get_message_summary(json_decode(utf8(message)))
             self.log.debug("Notebook client closed websocket connection - message dropped: {}".format(msg_summary))
 
     def on_close(self):
         self.log.debug("Closing websocket connection %s", self.request.path)
         self.gateway.on_close()
-        super(WebSocketChannelsHandler, self).on_close()
+        super().on_close()
 
     @staticmethod
     def _get_message_summary(message):
@@ -129,7 +129,7 @@ class GatewayWebSocketClient(LoggingConfigurable):
     """Proxy web socket connection to a kernel/enterprise gateway."""
 
     def __init__(self, **kwargs):
-        super(GatewayWebSocketClient, self).__init__(**kwargs)
+        super().__init__(**kwargs)
         self.kernel_id = None
         self.ws = None
         self.ws_future = Future()

notebook/gateway/managers.py

@@ -205,7 +205,7 @@ def validate_cert_default(self):
         return bool(os.environ.get(self.validate_cert_env, str(self.validate_cert_default_value)) not in ['no', 'false'])
 
     def __init__(self, **kwargs):
-        super(GatewayClient, self).__init__(**kwargs)
+        super().__init__(**kwargs)
         self._static_args = {}  # initialized on first use
 
     env_whitelist_default_value = ''
@@ -310,7 +310,7 @@ class GatewayKernelManager(MappingKernelManager):
     _kernels = {}
 
     def __init__(self, **kwargs):
-        super(GatewayKernelManager, self).__init__(**kwargs)
+        super().__init__(**kwargs)
         self.base_endpoint = url_path_join(GatewayClient.instance().url, GatewayClient.instance().kernels_endpoint)
 
     def __contains__(self, kernel_id):
@@ -507,7 +507,7 @@ def shutdown_all(self, now=False):
 class GatewayKernelSpecManager(KernelSpecManager):
 
     def __init__(self, **kwargs):
-        super(GatewayKernelSpecManager, self).__init__(**kwargs)
+        super().__init__(**kwargs)
         base_endpoint = url_path_join(GatewayClient.instance().url,
                                       GatewayClient.instance().kernelspecs_endpoint)
 

notebook/jstest.py

@@ -45,7 +45,7 @@ class StreamCapturer(Thread):
     daemon = True  # Don't hang if main thread crashes
     started = False
     def __init__(self, echo=False):
-        super(StreamCapturer, self).__init__()
+        super().__init__()
         self.echo = echo
         self.streams = []
         self.buffer = BytesIO()
@@ -264,14 +264,14 @@ def launch(self, buffer_output):
         # If the engine is SlimerJS, we need to buffer the output because
         # SlimerJS does not support exit codes, so CasperJS always returns 0.
         if self.engine == 'slimerjs' and not buffer_output:
-            return super(JSController, self).launch(capture_output=True)
+            return super().launch(capture_output=True)
 
         else:
-            return super(JSController, self).launch(buffer_output=buffer_output)
+            return super().launch(buffer_output=buffer_output)
 
     def wait(self, *pargs, **kwargs):
         """Wait for the JSController to finish"""
-        ret = super(JSController, self).wait(*pargs, **kwargs)
+        ret = super().wait(*pargs, **kwargs)
         # If this is a SlimerJS controller, check the captured stdout for
         # errors.  Otherwise, just return the return code.
         if self.engine == 'slimerjs':

notebook/nbconvert/handlers.py

@@ -83,8 +83,7 @@ class NbconvertFileHandler(IPythonHandler):
     def content_security_policy(self):
         # In case we're serving HTML/SVG, confine any Javascript to a unique
         # origin so it can't interact with the notebook server.
-        return super(NbconvertFileHandler, self).content_security_policy + \
-               "; sandbox allow-scripts"
+        return super().content_security_policy + "; sandbox allow-scripts"
 
     @web.authenticated
     @gen.coroutine
@@ -158,8 +157,7 @@ class NbconvertPostHandler(IPythonHandler):
     def content_security_policy(self):
         # In case we're serving HTML/SVG, confine any Javascript to a unique
         # origin so it can't interact with the notebook server.
-        return super(NbconvertPostHandler, self).content_security_policy + \
-               "; sandbox allow-scripts"
+        return super().content_security_policy + "; sandbox allow-scripts"
 
     @web.authenticated
     def post(self, format):

notebook/nbextensions.py

@@ -980,7 +980,7 @@ class NBExtensionApp(BaseExtensionApp):
 
     def start(self):
         """Perform the App's functions as configured"""
-        super(NBExtensionApp, self).start()
+        super().start()
 
         # The above should have called a subcommand and raised NoStart; if we
         # get here, it didn't, so we should self.log.info a message.

notebook/notebookapp.py

@@ -190,7 +190,7 @@ def __init__(self, jupyter_app, kernel_manager, contents_manager,
         if settings['autoreload']:
             log.info('Autoreload enabled: the webapp will restart when any Python src file changes.')
 
-        super(NotebookWebApplication, self).__init__(handlers, **settings)
+        super().__init__(handlers, **settings)
 
     def init_settings(self, jupyter_app, kernel_manager, contents_manager,
                       session_manager, kernel_spec_manager,
@@ -511,7 +511,7 @@ class NbserverStopApp(JupyterApp):
         help="UNIX socket of the server to be killed.")
 
     def parse_command_line(self, argv=None):
-        super(NbserverStopApp, self).parse_command_line(argv)
+        super().parse_command_line(argv)
         if self.extra_args:
             try:
                 self.port = int(self.extra_args[0])
@@ -1523,7 +1523,7 @@ def _update_server_extensions(self, change):
     terminals_available = False
 
     def parse_command_line(self, argv=None):
-        super(NotebookApp, self).parse_command_line(argv)
+        super().parse_command_line(argv)
 
         if self.extra_args:
             arg0 = self.extra_args[0]
@@ -2026,7 +2026,7 @@ def _init_asyncio_patch(self):
     def initialize(self, argv=None):
         self._init_asyncio_patch()
 
-        super(NotebookApp, self).initialize(argv)
+        super().initialize(argv)
         self.init_logging()
         if self._dispatching:
             return
@@ -2192,7 +2192,7 @@ def start(self):
         This method takes no arguments so all configuration and initialization
         must be done prior to calling this method."""
 
-        super(NotebookApp, self).start()
+        super().start()
 
         if not self.allow_root:
             # check if we are running as root, and abort if it's not allowed

notebook/serverextensions.py

@@ -291,7 +291,7 @@ class ServerExtensionApp(BaseExtensionApp):
 
     def start(self):
         """Perform the App's actions as configured"""
-        super(ServerExtensionApp, self).start()
+        super().start()
 
         # The above should have called a subcommand and raised NoStart; if we
         # get here, it didn't, so we should self.log.info a message.

notebook/services/contents/largefilemanager.py

@@ -27,7 +27,7 @@ def save(self, model, path=''):
                 if chunk == 1:
                     self.log.debug("Saving %s", os_path)
                     self.run_pre_save_hook(model=model, path=path)
-                    super(LargeFileManager, self)._save_file(os_path, model['content'], model.get('format'))
+                    super()._save_file(os_path, model['content'], model.get('format'))
                 else:
                     self._save_large_file(os_path, model['content'], model.get('format'))
             except web.HTTPError:
@@ -43,7 +43,7 @@ def save(self, model, path=''):
                 self.run_post_save_hook(model=model, os_path=os_path)
             return model
         else:
-            return super(LargeFileManager, self).save(model, path)
+            return super().save(model, path)
 
     def _save_large_file(self, os_path, content, format):
         """Save content of a generic file."""

notebook/services/kernels/handlers.py

@@ -190,7 +190,7 @@ def _finish_kernel_info(self, info):
             self._kernel_info_future.set_result(info)
 
     def initialize(self):
-        super(ZMQChannelsHandler, self).initialize()
+        super().initialize()
         self.zmq_stream = None
         self.channels = {}
         self.kernel_id = None
@@ -212,7 +212,7 @@ def initialize(self):
     @gen.coroutine
     def pre_get(self):
         # authenticate first
-        super(ZMQChannelsHandler, self).pre_get()
+        super().pre_get()
         # check session collision:
         yield self._register_session()
         # then request kernel info, waiting up to a certain time before giving up.
@@ -236,7 +236,7 @@ def give_up():
     @gen.coroutine
     def get(self, kernel_id):
         self.kernel_id = cast_unicode(kernel_id, 'ascii')
-        yield super(ZMQChannelsHandler, self).get(kernel_id=kernel_id)
+        yield super().get(kernel_id=kernel_id)
 
     @gen.coroutine
     def _register_session(self):
@@ -254,7 +254,7 @@ def _register_session(self):
         self._open_sessions[self.session_key] = self
 
     def open(self, kernel_id):
-        super(ZMQChannelsHandler, self).open()
+        super().open()
         km = self.kernel_manager
         km.notify_connect(kernel_id)
 
@@ -419,10 +419,10 @@ def write_stderr(error_message):
                 self._iopub_window_byte_count -= byte_count
                 self._iopub_window_byte_queue.pop(-1)
                 return
-        super(ZMQChannelsHandler, self)._on_zmq_reply(stream, msg)
+        super()._on_zmq_reply(stream, msg)
 
     def close(self):
-        super(ZMQChannelsHandler, self).close()
+        super().close()
         return self._close_future
 
     def on_close(self):