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-rw-r--r--sqlglot/_typing.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/sqlglot/_typing.py b/sqlglot/_typing.py
index 2acbbf7..86d965a 100644
--- a/sqlglot/_typing.py
+++ b/sqlglot/_typing.py
@@ -4,5 +4,10 @@ import typing as t
import sqlglot
+# A little hack for backwards compatibility with Python 3.7.
+# For example, we might want a TypeVar for objects that support comparison e.g. SupportsRichComparisonT from typeshed.
+# But Python 3.7 doesn't support Protocols, so we'd also need typing_extensions, which we don't want as a dependency.
+A = t.TypeVar("A", bound=t.Any)
+
E = t.TypeVar("E", bound="sqlglot.exp.Expression")
T = t.TypeVar("T")