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

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+# dialects/__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
+
+__all__ = (
+    "firebird",
+    "mssql",
+    "mysql",
+    "oracle",
+    "postgresql",
+    "sqlite",
+    "sybase",
+)
+
+from .. import util
+
+
+_translates = {"postgres": "postgresql"}
+
+
+def _auto_fn(name):
+    """default dialect importer.
+
+    plugs into the :class:`.PluginLoader`
+    as a first-hit system.
+
+    """
+    if "." in name:
+        dialect, driver = name.split(".")
+    else:
+        dialect = name
+        driver = "base"
+
+    if dialect in _translates:
+        translated = _translates[dialect]
+        util.warn_deprecated(
+            "The '%s' dialect name has been "
+            "renamed to '%s'" % (dialect, translated)
+        )
+        dialect = translated
+    try:
+        module = __import__("sqlalchemy.dialects.%s" % (dialect,)).dialects
+    except ImportError:
+        return None
+
+    module = getattr(module, dialect)
+    if hasattr(module, driver):
+        module = getattr(module, driver)
+        return lambda: module.dialect
+    else:
+        return None
+
+
+registry = util.PluginLoader("sqlalchemy.dialects", auto_fn=_auto_fn)
+
+plugins = util.PluginLoader("sqlalchemy.plugins")