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bpo-31709: Drop support for asynchronous __aiter__. (#3903)

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This commit is contained in:
Yury Selivanov 2017-10-06 02:08:57 -04:00 • committed by GitHub
parent 86566702f3
commit faa135acbf
9 changed files with 47 additions and 300 deletions
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54
Python/ceval.c
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@ -1708,7 +1708,6 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
TARGET(GET_AITER) {
unaryfunc getter = NULL;
PyObject *iter = NULL;
PyObject *awaitable = NULL;
PyObject *obj = TOP();
PyTypeObject *type = Py_TYPE(obj);
@ -1735,57 +1734,20 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
goto error;
}
if (Py_TYPE(iter)->tp_as_async != NULL &&
Py_TYPE(iter)->tp_as_async->am_anext != NULL) {
/* Starting with CPython 3.5.2 __aiter__ should return
asynchronous iterators directly (not awaitables that
resolve to asynchronous iterators.)
Therefore, we check if the object that was returned
from __aiter__ has an __anext__ method. If it does,
we wrap it in an awaitable that resolves to `iter`.
See http://bugs.python.org/issue27243 for more
details.
*/
PyObject *wrapper = _PyAIterWrapper_New(iter);
Py_DECREF(iter);
SET_TOP(wrapper);
DISPATCH();
}
awaitable = _PyCoro_GetAwaitableIter(iter);
if (awaitable == NULL) {
_PyErr_FormatFromCause(
PyExc_TypeError,
"'async for' received an invalid object "
"from __aiter__: %.100s",
Py_TYPE(iter)->tp_name);
if (Py_TYPE(iter)->tp_as_async == NULL ||
Py_TYPE(iter)->tp_as_async->am_anext == NULL) {
SET_TOP(NULL);
PyErr_Format(
PyExc_TypeError,
"'async for' received an object from __aiter__ "
"that does not implement __anext__: %.100s",
Py_TYPE(iter)->tp_name);
Py_DECREF(iter);
goto error;
} else {
Py_DECREF(iter);
if (PyErr_WarnFormat(
PyExc_DeprecationWarning, 1,
"'%.100s' implements legacy __aiter__ protocol; "
"__aiter__ should return an asynchronous "
"iterator, not awaitable",
type->tp_name))
{
/* Warning was converted to an error. */
Py_DECREF(awaitable);
SET_TOP(NULL);
goto error;
}
}
SET_TOP(awaitable);
PREDICT(LOAD_CONST);
SET_TOP(iter);
DISPATCH();
}