update back pre-commit hook

specify minimum target_version as py36

results in some churn

.pre-commit-config.yaml

@@ -4,7 +4,7 @@ repos:
   hooks:
   - id: reorder-python-imports
 - repo: https://github.com/psf/black
-  rev: 19.10b0
+  rev: 20.8b1
   hooks:
   - id: black
 - repo: https://github.com/pre-commit/pre-commit-hooks

jupyterhub/auth.py

@@ -101,7 +101,10 @@ class Authenticator(LoggingConfigurable):
         """
     ).tag(config=True)
 
-    whitelist = Set(help="Deprecated, use `Authenticator.allowed_users`", config=True,)
+    whitelist = Set(
+        help="Deprecated, use `Authenticator.allowed_users`",
+        config=True,
+    )
 
     allowed_users = Set(
         help="""
@@ -715,7 +718,9 @@ for _old_name, _new_name, _version in [
     ("check_blacklist", "check_blocked_users", "1.2"),
 ]:
     setattr(
-        Authenticator, _old_name, _deprecated_method(_old_name, _new_name, _version),
+        Authenticator,
+        _old_name,
+        _deprecated_method(_old_name, _new_name, _version),
     )
 
 
@@ -778,7 +783,9 @@ class LocalAuthenticator(Authenticator):
         """
     ).tag(config=True)
 
-    group_whitelist = Set(help="""DEPRECATED: use allowed_groups""",).tag(config=True)
+    group_whitelist = Set(
+        help="""DEPRECATED: use allowed_groups""",
+    ).tag(config=True)
 
     allowed_groups = Set(
         help="""

jupyterhub/handlers/base.py

@@ -489,7 +489,7 @@ class BaseHandler(RequestHandler):
         self.clear_cookie(
             'jupyterhub-services',
             path=url_path_join(self.base_url, 'services'),
-            **kwargs
+            **kwargs,
         )
         # Reset _jupyterhub_user
         self._jupyterhub_user = None
@@ -1485,10 +1485,14 @@ class UserUrlHandler(BaseHandler):
 
         # if request is expecting JSON, assume it's an API request and fail with 503
         # because it won't like the redirect to the pending page
-        if get_accepted_mimetype(
+        if (
-            self.request.headers.get('Accept', ''),
+            get_accepted_mimetype(
-            choices=['application/json', 'text/html'],
+                self.request.headers.get('Accept', ''),
-        ) == 'application/json' or 'api' in user_path.split('/'):
+                choices=['application/json', 'text/html'],
+            )
+            == 'application/json'
+            or 'api' in user_path.split('/')
+        ):
             self._fail_api_request(user_name, server_name)
             return
 

jupyterhub/oauth/provider.py

@@ -256,7 +256,7 @@ class JupyterHubRequestValidator(RequestValidator):
         self.db.commit()
 
     def get_authorization_code_scopes(self, client_id, code, redirect_uri, request):
-        """ Extracts scopes from saved authorization code.
+        """Extracts scopes from saved authorization code.
         The scopes returned by this method is used to route token requests
         based on scopes passed to Authorization Code requests.
         With that the token endpoint knows when to include OpenIDConnect

jupyterhub/pagination.py

@@ -107,14 +107,14 @@ class Pagination(Configurable):
 
     def calculate_pages_window(self):
         """Calculates the set of pages to render later in links() method.
-           It returns the list of pages to render via links for the pagination
+        It returns the list of pages to render via links for the pagination
-           By default, as we've observed in other applications, we're going to render
+        By default, as we've observed in other applications, we're going to render
-           only a finite and predefined number of pages, avoiding visual fatigue related
+        only a finite and predefined number of pages, avoiding visual fatigue related
-           to a long list of pages. By default, we render 7 pages plus some inactive links with the characters '...'
+        to a long list of pages. By default, we render 7 pages plus some inactive links with the characters '...'
-           to point out that there are other pages that aren't explicitly rendered.
+        to point out that there are other pages that aren't explicitly rendered.
-           The primary way of work is to provide current webpage and 5 next pages, the last 2 ones
+        The primary way of work is to provide current webpage and 5 next pages, the last 2 ones
-           (in case the current page + 5 does not overflow the total lenght of pages) and the first one for reference.
+        (in case the current page + 5 does not overflow the total lenght of pages) and the first one for reference.
-           """
+        """
 
         before_page = 2
         after_page = 2
@@ -158,9 +158,9 @@ class Pagination(Configurable):
     @property
     def links(self):
         """Get the links for the pagination.
-           Getting the input from calculate_pages_window(), generates the HTML code
+        Getting the input from calculate_pages_window(), generates the HTML code
-           for the pages to render, plus the arrows to go onwards and backwards (if needed).
+        for the pages to render, plus the arrows to go onwards and backwards (if needed).
-           """
+        """
         if self.total_pages == 1:
             return []
 

jupyterhub/tests/conftest.py

@@ -216,7 +216,7 @@ def admin_user(app, username):
 class MockServiceSpawner(jupyterhub.services.service._ServiceSpawner):
     """mock services for testing.
 
-       Shorter intervals, etc.
+    Shorter intervals, etc.
     """
 
     poll_interval = 1

jupyterhub/tests/test_api.py

@@ -182,7 +182,8 @@ async def test_get_users(app):
 
 @mark.user
 @mark.parametrize(
-    "state", ("inactive", "active", "ready", "invalid"),
+    "state",
+    ("inactive", "active", "ready", "invalid"),
 )
 async def test_get_users_state_filter(app, state):
     db = app.db

jupyterhub/tests/test_pages.py

@@ -265,7 +265,8 @@ async def test_spawn_with_query_arguments(app):
         next_url = ujoin(app.base_url, 'user/jones/tree')
         r = await async_requests.get(
             url_concat(
-                ujoin(base_url, 'spawn'), {'next': next_url, 'energy': '510keV'},
+                ujoin(base_url, 'spawn'),
+                {'next': next_url, 'energy': '510keV'},
             ),
             cookies=cookies,
         )

jupyterhub/tests/test_spawner.py

@@ -258,8 +258,7 @@ async def test_shell_cmd(db, tmpdir, request):
 
 
 def test_inherit_overwrite():
-    """On 3.6+ we check things are overwritten at import time
+    """On 3.6+ we check things are overwritten at import time"""
-    """
     if sys.version_info >= (3, 6):
         with pytest.raises(NotImplementedError):
 

jupyterhub/utils.py

@@ -75,8 +75,7 @@ def can_connect(ip, port):
 
 
 def make_ssl_context(keyfile, certfile, cafile=None, verify=True, check_hostname=True):
-    """Setup context for starting an https server or making requests over ssl.
+    """Setup context for starting an https server or making requests over ssl."""
-    """
     if not keyfile or not certfile:
         return None
     purpose = ssl.Purpose.SERVER_AUTH if verify else ssl.Purpose.CLIENT_AUTH
@@ -96,7 +95,7 @@ async def exponential_backoff(
     timeout=10,
     timeout_tolerance=0.1,
     *args,
-    **kwargs
+    **kwargs,
 ):
     """
     Exponentially backoff until `pass_func` is true.

pyproject.toml

@@ -1,2 +1,7 @@
 [tool.black]
 skip-string-normalization = true
+target_version = [
+    "py36",
+    "py37",
+    "py38",
+]