PR from branch users/gvit/refactor-modules

ref:9050248
sync: https://proxy.sandbox.yandex-team.ru/2714423438

Author: gridnevvvit

ydb/sqlalchemy/__init__.py

@@ -5,12 +5,12 @@
 
 from __future__ import absolute_import, unicode_literals
 
-import ydb
-from ydb.dbapi.errors import NotSupportedError
-from ydb.sqlalchemy.types import UInt32, UInt64
-
 
 try:
+    import ydb
+    from ydb.dbapi.errors import NotSupportedError
+    from ydb.sqlalchemy.types import UInt32, UInt64
+
     from sqlalchemy.engine.default import DefaultDialect
     from sqlalchemy.sql.compiler import (
         IdentifierPreparer,

ydb/sqlalchemy/types.py

@@ -1,18 +1,22 @@
-from sqlalchemy import types
-from sqlalchemy.sql import type_api
-from sqlalchemy.sql.elements import ColumnElement
-from sqlalchemy import util, exc
+try:
+    from sqlalchemy.types import Integer
+    from sqlalchemy.sql import type_api
+    from sqlalchemy.sql.elements import ColumnElement
+    from sqlalchemy import util, exc
+except ImportError:
+    Integer = object
+    ColumnElement = object
 
 
-class UInt32(types.Integer):
+class UInt32(Integer):
     __visit_name__ = "uint32"
 
 
-class UInt64(types.Integer):
+class UInt64(Integer):
     __visit_name__ = "uint64"
 
 
-class UInt8(types.Integer):
+class UInt8(Integer):
     __visit_name__ = "uint8"