Fix comments

src/snowflake/sqlalchemy/_constants.py

@@ -10,3 +10,4 @@
 
 APPLICATION_NAME = "SnowflakeSQLAlchemy"
 SNOWFLAKE_SQLALCHEMY_VERSION = VERSION
+DIALECT_NAME = "snowflake"

src/snowflake/sqlalchemy/snowdialect.py

@@ -42,14 +42,14 @@
 from snowflake.connector.constants import UTF8
 from snowflake.sqlalchemy.compat import returns_unicode
 
+from ._constants import DIALECT_NAME
 from .base import (
     SnowflakeCompiler,
     SnowflakeDDLCompiler,
     SnowflakeExecutionContext,
     SnowflakeIdentifierPreparer,
     SnowflakeTypeCompiler,
 )
-from .constants import DIALECT_NAME
 from .custom_types import (
     _CUSTOM_DECIMAL,
     ARRAY,

src/snowflake/sqlalchemy/sql/custom_schema/custom_table_base.py

@@ -7,8 +7,8 @@
 from sqlalchemy.exc import ArgumentError
 from sqlalchemy.sql.schema import MetaData, SchemaItem, Table
 
+from ..._constants import DIALECT_NAME
 from ...compat import IS_VERSION_20
-from ...constants import DIALECT_NAME
 from ...custom_commands import NoneType
 from .options.table_option import TableOption
 

src/snowflake/sqlalchemy/sql/custom_schema/options/target_lag.py

@@ -48,7 +48,7 @@ def template() -> str:
 
     def get_expression(self):
         return (
-            ("'" + str(self.time) + " " + str(self.unit.value) + "'")
+            f"'{str(self.time)} {str(self.unit.value)}'"
             if not self.down_stream
             else "DOWNSTREAM"
         )