fixed code style

caravel/models.py

@@ -428,10 +428,10 @@ class Database(Model, AuditMixinNullable):
             if self.sqlalchemy_uri.startswith(db_type):
                 return grains
 
-    def dttm_converter(self, dttm, tf = None):
+    def dttm_converter(self, dttm, tf=None):
+        """Returns a string that the database flavor understands as a date"""
         if tf is None or tf == '':
             tf = '%Y-%m-%d %H:%M:%S.%f'
-        """Returns a string that the database flavor understands as a date"""
         default = "'{}'".format(dttm.strftime(tf))
         iso = dttm.isoformat()
         d = {

caravel/views.py

@@ -290,7 +290,8 @@ class TableModelView(CaravelModelView, DeleteMixin):  # noqa
         'table_name', 'database', 'schema', 'timestamp_format',
         'default_endpoint', 'offset', 'cache_timeout']
     edit_columns = [
-        'table_name', 'is_featured', 'database', 'schema', 'timestamp_format', 'description', 'owner',
+        'table_name', 'is_featured', 'database', 'schema',
+        'timestamp_format', 'description', 'owner',
         'main_dttm_col', 'default_endpoint', 'offset', 'cache_timeout']
     related_views = [TableColumnInlineView, SqlMetricInlineView]
     base_order = ('changed_on', 'desc')

caravel/viz.py

@@ -151,7 +151,8 @@ class BaseViz(object):
             raise Exception("No data, review your incantations!")
         else:
             if 'timestamp' in df.columns:
-                df.timestamp = pd.to_datetime(df.timestamp, utc=False, format=timestamp_format)
+                df.timestamp = pd.to_datetime(df.timestamp,
+                utc=False, format=timestamp_format)
                 if self.datasource.offset:
                     df.timestamp += timedelta(hours=self.datasource.offset)
         df = df.fillna(0)