bpo-36999: Add asyncio.Task.get_coro() (GH-13680)

https://bugs.python.org/issue36999

Author: agronholm

Doc/library/asyncio-task.rst

@@ -842,6 +842,12 @@ Task Object
       The *file* argument is an I/O stream to which the output
       is written; by default output is written to :data:`sys.stderr`.
 
+   .. method:: get_coro()
+
+      Return the coroutine object wrapped by the :class:`Task`.
+
+      .. versionadded:: 3.8
+
    .. method:: get_name()
 
       Return the name of the Task.

Lib/asyncio/tasks.py

@@ -152,6 +152,9 @@ def __del__(self):
     def _repr_info(self):
         return base_tasks._task_repr_info(self)
 
+    def get_coro(self):
+        return self._coro
+
     def get_name(self):
         return self._name
 

Lib/test/test_asyncio/test_tasks.py

@@ -2425,6 +2425,16 @@ async def main():
 
         self.assertEqual(cvar.get(), -1)
 
+    def test_get_coro(self):
+        loop = asyncio.new_event_loop()
+        coro = coroutine_function()
+        try:
+            task = self.new_task(loop, coro)
+            loop.run_until_complete(task)
+            self.assertIs(task.get_coro(), coro)
+        finally:
+            loop.close()
+
 
 def add_subclass_tests(cls):
     BaseTask = cls.Task

Misc/NEWS.d/next/Library/2019-05-30-13-30-46.bpo-36999.EjY_L2.rst

@@ -0,0 +1,2 @@
+Add the ``asyncio.Task.get_coro()`` method to publicly expose the tasks's
+coroutine object.

Modules/_asynciomodule.c

@@ -2313,6 +2313,18 @@ _asyncio_Task_set_exception(TaskObj *self, PyObject *exception)
     return NULL;
 }
 
+/*[clinic input]
+_asyncio.Task.get_coro
+[clinic start generated code]*/
+
+static PyObject *
+_asyncio_Task_get_coro_impl(TaskObj *self)
+/*[clinic end generated code: output=bcac27c8cc6c8073 input=d2e8606c42a7b403]*/
+{
+    Py_INCREF(self->task_coro);
+    return self->task_coro;
+}
+
 /*[clinic input]
 _asyncio.Task.get_name
 [clinic start generated code]*/
@@ -2439,6 +2451,7 @@ static PyMethodDef TaskType_methods[] = {
     _ASYNCIO_TASK__REPR_INFO_METHODDEF
     _ASYNCIO_TASK_GET_NAME_METHODDEF
     _ASYNCIO_TASK_SET_NAME_METHODDEF
+    _ASYNCIO_TASK_GET_CORO_METHODDEF
     {NULL, NULL}        /* Sentinel */
 };