diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index a83a59d4e73e9..22a6a0c1e6c10 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -16,7 +16,7 @@
 #
 repos:
 -   repo: https://github.com/ambv/black
-    rev: 19.3b0
+    rev: 19.10b0
     hooks:
     -   id: black
         language_version: python3
diff --git a/requirements-dev.txt b/requirements-dev.txt
index e3c6f957cd68b..77820f4d49c46 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -14,13 +14,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-black==19.3b0
+black==19.10b0
 coverage==4.5.3
 flask-cors==3.0.7
 flask-testing==0.7.1
 ipdb==0.12
 isort==4.3.21
-mypy==0.670
+mypy==0.770
 nose==1.3.7
 pip-tools==4.5.1
 pre-commit==1.17.0
diff --git a/superset/connectors/druid/models.py b/superset/connectors/druid/models.py
index 517a458d4c4f5..a1e15c6f0c27b 100644
--- a/superset/connectors/druid/models.py
+++ b/superset/connectors/druid/models.py
@@ -810,7 +810,7 @@ def granularity(
             "year": "P1Y",
         }
 
-        granularity = {"type": "period"}
+        granularity: Dict[str, Union[str, float]] = {"type": "period"}
         if timezone:
             granularity["timeZone"] = timezone
 
@@ -831,7 +831,7 @@ def granularity(
             granularity["period"] = period_name
         else:
             granularity["type"] = "duration"
-            granularity["duration"] = (  # type: ignore
+            granularity["duration"] = (
                 utils.parse_human_timedelta(period_name).total_seconds() * 1000
             )
         return granularity
@@ -941,23 +941,24 @@ def metrics_and_post_aggs(
         adhoc_agg_configs = []
         postagg_names = []
         for metric in metrics:
-            if utils.is_adhoc_metric(metric):
+            if isinstance(metric, dict) and utils.is_adhoc_metric(metric):
                 adhoc_agg_configs.append(metric)
-            elif metrics_dict[metric].metric_type != POST_AGG_TYPE:  # type: ignore
-                saved_agg_names.add(metric)
-            else:
-                postagg_names.append(metric)
+            elif isinstance(metric, str):
+                if metrics_dict[metric].metric_type != POST_AGG_TYPE:
+                    saved_agg_names.add(metric)
+                else:
+                    postagg_names.append(metric)
         # Create the post aggregations, maintain order since postaggs
         # may depend on previous ones
         post_aggs: "OrderedDict[str, Postaggregator]" = OrderedDict()
         visited_postaggs = set()
         for postagg_name in postagg_names:
-            postagg = metrics_dict[postagg_name]  # type: ignore
+            postagg = metrics_dict[postagg_name]
             visited_postaggs.add(postagg_name)
             DruidDatasource.resolve_postagg(
                 postagg, post_aggs, saved_agg_names, visited_postaggs, metrics_dict
             )
-        aggs = DruidDatasource.get_aggregations(  # type: ignore
+        aggs = DruidDatasource.get_aggregations(
             metrics_dict, saved_agg_names, adhoc_agg_configs
         )
         return aggs, post_aggs
diff --git a/superset/forms.py b/superset/forms.py
index fd2d078f834b4..175903af20b94 100644
--- a/superset/forms.py
+++ b/superset/forms.py
@@ -23,7 +23,7 @@
 
 class CommaSeparatedListField(Field):
     widget = BS3TextFieldWidget()
-    data = []  # type: List[str]
+    data: List[str] = []
 
     def _value(self):
         if self.data:
diff --git a/superset/models/core.py b/superset/models/core.py
index 81392d7591edf..1f56019ff3700 100755
--- a/superset/models/core.py
+++ b/superset/models/core.py
@@ -460,7 +460,7 @@ def get_all_table_names_in_schema(
         self,
         schema: str,
         cache: bool = False,
-        cache_timeout: int = None,
+        cache_timeout: Optional[int] = None,
         force: bool = False,
     ) -> List[utils.DatasourceName]:
         """Parameters need to be passed as keyword arguments.
@@ -492,7 +492,7 @@ def get_all_view_names_in_schema(
         self,
         schema: str,
         cache: bool = False,
-        cache_timeout: int = None,
+        cache_timeout: Optional[int] = None,
         force: bool = False,
     ) -> List[utils.DatasourceName]:
         """Parameters need to be passed as keyword arguments.
diff --git a/superset/utils/core.py b/superset/utils/core.py
index 95f103298c5c1..778c71eac713d 100644
--- a/superset/utils/core.py
+++ b/superset/utils/core.py
@@ -51,7 +51,7 @@
 from cryptography.hazmat.backends.openssl.x509 import _Certificate
 from dateutil.parser import parse
 from dateutil.relativedelta import relativedelta
-from flask import current_app, flash, Flask, g, Markup, render_template
+from flask import current_app, flash, g, Markup, render_template
 from flask_appbuilder import SQLA
 from flask_appbuilder.security.sqla.models import User
 from flask_babel import gettext as __, lazy_gettext as _
@@ -1057,15 +1057,11 @@ def get_since_until(
         else:
             rel, num, grain = time_range.split()
             if rel == "Last":
-                since = relative_start - relativedelta(  # type: ignore
-                    **{grain: int(num)}
-                )
+                since = relative_start - relativedelta(**{grain: int(num)})  # type: ignore
                 until = relative_end
             else:  # rel == 'Next'
                 since = relative_start
-                until = relative_end + relativedelta(  # type: ignore
-                    **{grain: int(num)}
-                )
+                until = relative_end + relativedelta(**{grain: int(num)})  # type: ignore
     else:
         since = since or ""
         if since:
@@ -1184,7 +1180,7 @@ def parse_ssl_cert(certificate: str) -> _Certificate:
         return x509.load_pem_x509_certificate(
             certificate.encode("utf-8"), default_backend()
         )
-    except ValueError as e:
+    except ValueError:
         raise CertificateException("Invalid certificate")
 
 
diff --git a/superset/views/core.py b/superset/views/core.py
index 6c5497d4c3f86..02fd207486c33 100755
--- a/superset/views/core.py
+++ b/superset/views/core.py
@@ -188,7 +188,10 @@ def check_datasource_perms(
     except SupersetException as e:
         raise SupersetSecurityException(str(e))
 
-    viz_obj = get_viz(  # type: ignore
+    if datasource_type is None:
+        raise SupersetSecurityException("Could not determine datasource type")
+
+    viz_obj = get_viz(
         datasource_type=datasource_type,
         datasource_id=datasource_id,
         form_data=form_data,
diff --git a/superset/views/schedules.py b/superset/views/schedules.py
index ad7861e75af5c..e84e3412c8fa4 100644
--- a/superset/views/schedules.py
+++ b/superset/views/schedules.py
@@ -48,7 +48,7 @@ class EmailScheduleView(
 ):  # pylint: disable=too-many-ancestors
     include_route_methods = RouteMethod.CRUD_SET
     _extra_data = {"test_email": False, "test_email_recipients": None}
-    schedule_type: Optional[Type] = None
+    schedule_type: Optional[str] = None
     schedule_type_model: Optional[Type] = None
 
     page_size = 20
diff --git a/tests/access_tests.py b/tests/access_tests.py
index 63cbfb5c7054d..58affb640e429 100644
--- a/tests/access_tests.py
+++ b/tests/access_tests.py
@@ -567,10 +567,7 @@ def test_request_access(self):
             self.get_resp(ACCESS_REQUEST.format("druid", druid_ds_4_id, "go"))
             access_request4 = self.get_access_requests("gamma", "druid", druid_ds_4_id)
 
-            self.assertEqual(
-                access_request4.roles_with_datasource,
-                "<ul></ul>".format(access_request4.id),
-            )
+            self.assertEqual(access_request4.roles_with_datasource, "<ul></ul>")
 
             # Case 5. Roles exist that contains the druid datasource.
             # add druid ds to the existing roles
diff --git a/tests/db_engine_specs/hive_tests.py b/tests/db_engine_specs/hive_tests.py
index 4d24c0bdf25af..15de3ce6693df 100644
--- a/tests/db_engine_specs/hive_tests.py
+++ b/tests/db_engine_specs/hive_tests.py
@@ -58,7 +58,7 @@ def test_job_1_launched_stage_1(self):
         self.assertEqual(0, HiveEngineSpec.progress(log))
 
     def test_job_1_launched_stage_1_map_40_progress(
-        self
+        self,
     ):  # pylint: disable=invalid-name
         log = """
             17/02/07 19:15:55 INFO ql.Driver: Total jobs = 2
@@ -71,7 +71,7 @@ def test_job_1_launched_stage_1_map_40_progress(
         self.assertEqual(10, HiveEngineSpec.progress(log))
 
     def test_job_1_launched_stage_1_map_80_reduce_40_progress(
-        self
+        self,
     ):  # pylint: disable=invalid-name
         log = """
             17/02/07 19:15:55 INFO ql.Driver: Total jobs = 2
@@ -85,7 +85,7 @@ def test_job_1_launched_stage_1_map_80_reduce_40_progress(
         self.assertEqual(30, HiveEngineSpec.progress(log))
 
     def test_job_1_launched_stage_2_stages_progress(
-        self
+        self,
     ):  # pylint: disable=invalid-name
         log = """
             17/02/07 19:15:55 INFO ql.Driver: Total jobs = 2
@@ -101,7 +101,7 @@ def test_job_1_launched_stage_2_stages_progress(
         self.assertEqual(12, HiveEngineSpec.progress(log))
 
     def test_job_2_launched_stage_2_stages_progress(
-        self
+        self,
     ):  # pylint: disable=invalid-name
         log = """
             17/02/07 19:15:55 INFO ql.Driver: Total jobs = 2
@@ -145,7 +145,7 @@ def test_hive_error_msg(self):
         )
 
     def test_hive_get_view_names_return_empty_list(
-        self
+        self,
     ):  # pylint: disable=invalid-name
         self.assertEqual(
             [], HiveEngineSpec.get_view_names(mock.ANY, mock.ANY, mock.ANY)
diff --git a/tests/db_engine_specs/presto_tests.py b/tests/db_engine_specs/presto_tests.py
index cf62b282d4a47..0ca06359a0461 100644
--- a/tests/db_engine_specs/presto_tests.py
+++ b/tests/db_engine_specs/presto_tests.py
@@ -32,7 +32,7 @@ def test_get_datatype_presto(self):
         self.assertEqual("STRING", PrestoEngineSpec.get_datatype("string"))
 
     def test_presto_get_view_names_return_empty_list(
-        self
+        self,
     ):  # pylint: disable=invalid-name
         self.assertEqual(
             [], PrestoEngineSpec.get_view_names(mock.ANY, mock.ANY, mock.ANY)
diff --git a/tests/superset_test_config.py b/tests/superset_test_config.py
index d95b91a089e71..ff0a1e57f2449 100644
--- a/tests/superset_test_config.py
+++ b/tests/superset_test_config.py
@@ -14,9 +14,10 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# type: ignore
 from copy import copy
 
-from superset.config import *  # type: ignore
+from superset.config import *
 
 AUTH_USER_REGISTRATION_ROLE = "alpha"
 SQLALCHEMY_DATABASE_URI = "sqlite:///" + os.path.join(DATA_DIR, "unittests.db")
diff --git a/tests/superset_test_config_sqllab_backend_persist.py b/tests/superset_test_config_sqllab_backend_persist.py
index 86619a2ff739a..27d721ff5fd60 100644
--- a/tests/superset_test_config_sqllab_backend_persist.py
+++ b/tests/superset_test_config_sqllab_backend_persist.py
@@ -15,10 +15,11 @@
 # specific language governing permissions and limitations
 # under the License.
 # flake8: noqa
+# type: ignore
 import os
 from copy import copy
 
-from superset.config import *  # type: ignore
+from superset.config import *
 
 AUTH_USER_REGISTRATION_ROLE = "alpha"
 SQLALCHEMY_DATABASE_URI = "sqlite:///" + os.path.join(DATA_DIR, "unittests.db")