Enhance issubclass() and PyObject_IsSubclass() so that a tuple is
supported as the second argument. This has the same meaning as
for isinstance(), i.e. issubclass(X, (A, B)) is equivalent
to issubclass(X, A) or issubclass(X, B). Compared to isinstance(),
this patch does not search the tuple recursively for classes, i.e.
any entry in the tuple that is not a class, will result in a
TypeError.
This closes SF patch #649608.
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 7e7ad2e..ab76006 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -1586,7 +1586,9 @@
PyDoc_STRVAR(issubclass_doc,
"issubclass(C, B) -> bool\n\
\n\
-Return whether class C is a subclass (i.e., a derived class) of class B.");
+Return whether class C is a subclass (i.e., a derived class) of class B.\n\
+When using a tuple as the second argument issubclass(X, (A, B, ...)),\n\
+is a shortcut for issubclass(X, A) or issubclass(X, B) or ... (etc.).");
static PyObject*