[3.6] Fix TypeError is asyncio/proactor_events (GH-993) (#2061)

1st1 · web-flow · commit 361362f3a0d6 · 2017-06-10T00:15:28.000-04:00
(cherry picked from commit 34792d2)
diff --git a/Lib/asyncio/proactor_events.py b/Lib/asyncio/proactor_events.py
@@ -232,8 +232,9 @@ class _ProactorBaseWritePipeTransport(_ProactorBasePipeTransport,
 
     def write(self, data):
         if not isinstance(data, (bytes, bytearray, memoryview)):
-            raise TypeError('data argument must be byte-ish (%r)',
-                            type(data))
+            msg = ("data argument must be a bytes-like object, not '%s'" %
+                   type(data).__name__)
+            raise TypeError(msg)
         if self._eof_written:
             raise RuntimeError('write_eof() already called')
 
