remove unused imports (#3621)

* superset: remove unused imports

Spotted by pyflakes

* superset: removed unused get_session

superset/__init__.py

@@ -154,7 +154,6 @@ def index(self):
 
 sm = appbuilder.sm
 
-get_session = appbuilder.get_session
 results_backend = app.config.get("RESULTS_BACKEND")
 
 # Registering sources

superset/cli.py

@@ -5,7 +5,6 @@
 from __future__ import unicode_literals
 
 import logging
-from celery.bin import worker as celery_worker
 from datetime import datetime
 from subprocess import Popen
 

superset/connectors/druid/models.py

@@ -11,7 +11,7 @@
 import sqlalchemy as sa
 from sqlalchemy import (
     Column, Integer, String, ForeignKey, Text, Boolean,
-    DateTime, or_, and_,
+    DateTime, or_,
 )
 from sqlalchemy.orm import backref, relationship
 from dateutil.parser import parse as dparse
@@ -30,7 +30,7 @@
 
 from flask_babel import lazy_gettext as _
 
-from superset import conf, db, import_util, utils, sm, get_session
+from superset import conf, db, import_util, utils, sm
 from superset.utils import (
     flasher, MetricPermException, DimSelector, DTTM_ALIAS
 )

superset/connectors/druid/views.py

@@ -1,8 +1,6 @@
 from datetime import datetime
 import logging
 
-import sqlalchemy as sqla
-
 from flask import Markup, flash, redirect
 from flask_appbuilder import CompactCRUDMixin, expose
 from flask_appbuilder.models.sqla.interface import SQLAInterface

superset/connectors/sqla/views.py

@@ -1,11 +1,9 @@
 """Views used by the SqlAlchemy connector"""
-import logging
 from past.builtins import basestring
 
 from flask import Markup, flash, redirect
 from flask_appbuilder import CompactCRUDMixin, expose
 from flask_appbuilder.models.sqla.interface import SQLAInterface
-import sqlalchemy as sa
 
 from flask_babel import lazy_gettext as _
 from flask_babel import gettext as __