Update syntax for existing type annotations

Uses syntax described in PEP484.

securedrop/crypto_util.py

@@ -135,8 +135,7 @@ def do_runtime_tests(self):
         if not rm.check_secure_delete_capability():
             raise AssertionError("Secure file deletion is not possible.")
 
-    def get_wordlist(self, locale):
-        # type: (Text) -> List[str]
+    def get_wordlist(self, locale: Text) -> List[str]:
         """" Ensure the wordlist for the desired locale is read and available
         in the words global variable. If there is no wordlist for the
         desired local, fallback to the default english wordlist.

securedrop/journalist_app/__init__.py

@@ -38,8 +38,7 @@
 _insecure_views = ['main.login', 'main.select_logo', 'static']
 
 
-def create_app(config):
-    # type: (SDConfig) -> Flask
+def create_app(config: SDConfig) -> Flask:
     app = Flask(__name__,
                 template_folder=config.JOURNALIST_TEMPLATES_DIR,
                 static_folder=path.join(config.SECUREDROP_ROOT, 'static'))
@@ -82,16 +81,14 @@ def create_app(config):
     )
 
     @app.errorhandler(CSRFError)
-    def handle_csrf_error(e):
-        # type: (CSRFError) -> Response
+    def handle_csrf_error(e: CSRFError) -> Response:
         # render the message first to ensure it's localized.
         msg = gettext('You have been logged out due to inactivity')
         session.clear()
         flash(msg, 'error')
         return redirect(url_for('main.login'))
 
-    def _handle_http_exception(error):
-        # type: (HTTPException) -> Tuple[Union[Response, str], Optional[int]]
+    def _handle_http_exception(error: HTTPException) -> Tuple[Union[Response, str], Optional[int]]:
         # Workaround for no blueprint-level 404/5 error handlers, see:
         # https://github.com/pallets/flask/issues/503#issuecomment-71383286
         handler = list(app.error_handler_spec['api'][error.code].values())[0]
@@ -129,8 +126,7 @@ def load_instance_config():
         app.instance_config = InstanceConfig.get_current()
 
     @app.before_request
-    def setup_g():
-        # type: () -> Optional[Response]
+    def setup_g() -> Optional[Response]:
         """Store commonly used values in Flask's special g object"""
         if 'expires' in session and datetime.utcnow() >= session['expires']:
             session.clear()

securedrop/journalist_app/utils.py

@@ -27,8 +27,7 @@
     from sdconfig import SDConfig  # noqa: F401
 
 
-def logged_in():
-    # type: () -> bool
+def logged_in() -> bool:
     # When a user is logged in, we push their user ID (database primary key)
     # into the session. setup_g checks for this value, and if it finds it,
     # stores a reference to the user's Journalist object in g.
@@ -255,8 +254,7 @@ def col_delete(cols_selected):
     return redirect(url_for('main.index'))
 
 
-def make_password(config):
-    # type: (SDConfig) -> str
+def make_password(config: SDConfig) -> str:
     while True:
         password = current_app.crypto_util.genrandomid(
             7,