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venv/Lib/site-packages/sqlalchemy/pool/__init__.py

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+# sqlalchemy/pool/__init__.py
+# Copyright (C) 2005-2019 the SQLAlchemy authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: http://www.opensource.org/licenses/mit-license.php
+
+
+"""Connection pooling for DB-API connections.
+
+Provides a number of connection pool implementations for a variety of
+usage scenarios and thread behavior requirements imposed by the
+application, DB-API or database itself.
+
+Also provides a DB-API 2.0 connection proxying mechanism allowing
+regular DB-API connect() methods to be transparently managed by a
+SQLAlchemy connection pool.
+"""
+
+from .base import _ConnectionFairy  # noqa
+from .base import _ConnectionRecord  # noqa
+from .base import _finalize_fairy  # noqa
+from .base import _refs  # noqa
+from .base import Pool
+from .base import reset_commit
+from .base import reset_none
+from .base import reset_rollback
+from .dbapi_proxy import clear_managers
+from .dbapi_proxy import manage
+from .impl import AssertionPool
+from .impl import NullPool
+from .impl import QueuePool
+from .impl import SingletonThreadPool
+from .impl import StaticPool
+
+
+__all__ = [
+    "Pool",
+    "reset_commit",
+    "reset_none",
+    "reset_rollback",
+    "clear_managers",
+    "manage",
+    "AssertionPool",
+    "NullPool",
+    "QueuePool",
+    "SingletonThreadPool",
+    "StaticPool",
+]
+
+# as these are likely to be used in various test suites, debugging
+# setups, keep them in the sqlalchemy.pool namespace