asyncio: Tulip issue 173: Enhance repr(Handle) and repr(Task)

repr(Handle) is shorter for function: "foo" instead of "<function foo at
0x...>". It now also includes the source of the callback, filename and line
number where it was defined, if available.

repr(Task) now also includes the current position in the code, filename and
line number, if available. If the coroutine (generator) is done, the line
number is omitted and "done" is added.

1 files changed, 9 insertions, 1 deletions

diff --git a/Lib/asyncio/tasks.py b/Lib/asyncio/tasks.py
index 8b8fb82ed2..e6fd3d380b 100644
--- a/Lib/asyncio/tasks.py
+++ b/Lib/asyncio/tasks.py
@@ -188,7 +188,15 @@ class Task(futures.Future):
         i = res.find('<')
         if i < 0:
             i = len(res)
-        res = res[:i] + '(<{}>)'.format(self._coro.__name__) + res[i:]
+        text = self._coro.__name__
+        coro = self._coro
+        if inspect.isgenerator(coro):
+            filename = coro.gi_code.co_filename
+            if coro.gi_frame is not None:
+                text += ' at %s:%s' % (filename, coro.gi_frame.f_lineno)
+            else:
+                text += ' done at %s' % filename
+        res = res[:i] + '(<{}>)'.format(text) + res[i:]
         return res
 
     def get_stack(self, *, limit=None):