diff options
Diffstat (limited to 'lib/sqlalchemy/sql/elements.py')
| -rw-r--r-- | lib/sqlalchemy/sql/elements.py | 24 |
1 files changed, 10 insertions, 14 deletions
diff --git a/lib/sqlalchemy/sql/elements.py b/lib/sqlalchemy/sql/elements.py index 444273e67..4d5bb9476 100644 --- a/lib/sqlalchemy/sql/elements.py +++ b/lib/sqlalchemy/sql/elements.py @@ -1617,10 +1617,10 @@ class Null(ColumnElement): return type_api.NULLTYPE @classmethod - def _singleton(cls): + def _instance(cls): """Return a constant :class:`.Null` construct.""" - return NULL + return Null() def compare(self, other): return isinstance(other, Null) @@ -1641,11 +1641,11 @@ class False_(ColumnElement): return type_api.BOOLEANTYPE def _negate(self): - return TRUE + return True_() @classmethod - def _singleton(cls): - """Return a constant :class:`.False_` construct. + def _instance(cls): + """Return a :class:`.False_` construct. E.g.:: @@ -1679,7 +1679,7 @@ class False_(ColumnElement): """ - return FALSE + return False_() def compare(self, other): return isinstance(other, False_) @@ -1700,17 +1700,17 @@ class True_(ColumnElement): return type_api.BOOLEANTYPE def _negate(self): - return FALSE + return False_() @classmethod def _ifnone(cls, other): if other is None: - return cls._singleton() + return cls._instance() else: return other @classmethod - def _singleton(cls): + def _instance(cls): """Return a constant :class:`.True_` construct. E.g.:: @@ -1745,15 +1745,11 @@ class True_(ColumnElement): """ - return TRUE + return True_() def compare(self, other): return isinstance(other, True_) -NULL = Null() -FALSE = False_() -TRUE = True_() - class ClauseList(ClauseElement): """Describe a list of clauses, separated by an operator. |