diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 0f182d42402063..cb5a619f02a48c 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -63,6 +63,13 @@ def text_encoding(encoding, stacklevel=2):
return encoding
+# Wrapper for builtins.open
+#
+# Trick so that open() won't become a bound method when stored
+# as a class variable (as dbm.dumb does).
+#
+# See init_set_builtins_open() in Python/pylifecycle.c.
+@staticmethod
def open(file, mode="r", buffering=-1, encoding=None, errors=None,
newline=None, closefd=True, opener=None):
@@ -313,18 +320,9 @@ def __get__(self, obj, typ=None):
"errors=None, newline=None, closefd=True)\n\n" +
open.__doc__)
-class OpenWrapper:
- """Wrapper for builtins.open
- Trick so that open won't become a bound method when stored
- as a class variable (as dbm.dumb does).
-
- See initstdio() in Python/pylifecycle.c.
- """
- __doc__ = DocDescriptor()
-
- def __new__(cls, *args, **kwargs):
- return open(*args, **kwargs)
+# bpo-43680: Alias to open() kept for backward compatibility
+OpenWrapper = open
# In normal operation, both `UnsupportedOperation`s should be bound to the
diff --git a/Misc/NEWS.d/next/Library/2021-04-12-09-57-37.bpo-43680.o1zEk_.rst b/Misc/NEWS.d/next/Library/2021-04-12-09-57-37.bpo-43680.o1zEk_.rst
new file mode 100644
index 00000000000000..cb561ae586a98d
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2021-04-12-09-57-37.bpo-43680.o1zEk_.rst
@@ -0,0 +1,6 @@
+The Python :func:`_pyio.open` function becomes a static method to behave as
+:func:`io.open` built-in function: don't become a bound method when stored as a
+class variable. It becomes possible since static methods are now callable in
+Python 3.10. Moreover, :func:`_pyio.OpenWrapper` becomes a simple alias to
+:func:`_pyio.open`.
+Patch by Victor Stinner.
diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index 0ad1796e3cbc6e..2dbebe45fd4b0b 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -2241,7 +2241,7 @@ create_stdio(const PyConfig *config, PyObject* io,
return NULL;
}
-/* Set builtins.open to io.OpenWrapper */
+/* Set builtins.open to io.open */
static PyStatus
init_set_builtins_open(void)
{
@@ -2257,7 +2257,7 @@ init_set_builtins_open(void)
goto error;
}
- if (!(wrapper = PyObject_GetAttrString(iomod, "OpenWrapper"))) {
+ if (!(wrapper = PyObject_GetAttrString(iomod, "open"))) {
goto error;
}
@@ -2279,7 +2279,7 @@ init_set_builtins_open(void)
}
-/* Initialize sys.stdin, stdout, stderr and builtins.open */
+/* Create sys.stdin, sys.stdout and sys.stderr */
static PyStatus
init_sys_streams(PyThreadState *tstate)
{
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