Apply underscore naming to several more operators

The operator changes are:

* `isfalse` is now `is_false`
* `isnot_distinct_from` is now `is_not_distinct_from`
* `istrue` is now `is_true`
* `notbetween` is now `not_between`
* `notcontains` is now `not_contains`
* `notendswith` is now `not_endswith`
* `notilike` is now `not_ilike`
* `notlike` is now `not_like`
* `notmatch` is now `not_match`
* `notstartswith` is now `not_startswith`
* `nullsfirst` is now `nulls_first`
* `nullslast` is now `nulls_last`

Because these are core operators, the internal migration strategy for this
change is to support legacy terms for an extended period of time -- if not
indefinitely -- but update all documentation, tutorials, and internal usage
to the new terms.  The new terms are used to define the functions, and
the legacy terms have been deprecated into aliases of the new terms.

Fixes: #5435
Change-Id: Ifbd7cb1cdda5981990243c4fc4b4ff467dc132ac

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/sqlalchemy/dialects/sqlite/base.py b/lib/sqlalchemy/dialects/sqlite/base.py
index 8a4fbe8e5..5efd0d9c9 100644
--- a/lib/sqlalchemy/dialects/sqlite/base.py
+++ b/lib/sqlalchemy/dialects/sqlite/base.py
@@ -1043,7 +1043,7 @@ class SQLiteCompiler(compiler.SQLCompiler):
             self.process(binary.right),
         )
 
-    def visit_isnot_distinct_from_binary(self, binary, operator, **kw):
+    def visit_is_not_distinct_from_binary(self, binary, operator, **kw):
         return "%s IS %s" % (
             self.process(binary.left),
             self.process(binary.right),