diff --git a/Lib/asynchat.py b/Lib/asynchat.py
index fc1146adbb10dc..0e56a3da66b3e0 100644
--- a/Lib/asynchat.py
+++ b/Lib/asynchat.py
@@ -191,8 +191,8 @@ def handle_close(self):
 
     def push(self, data):
         if not isinstance(data, (bytes, bytearray, memoryview)):
-            raise TypeError('data argument must be byte-ish (%r)',
-                            type(data))
+            raise TypeError('data argument must be a bytes-like object, not %r' %
+                            type(data).__name__)
         sabs = self.ac_out_buffer_size
         if len(data) > sabs:
             for i in range(0, len(data), sabs):
diff --git a/Lib/asyncio/proactor_events.py b/Lib/asyncio/proactor_events.py
index ff12877fae2f23..72146b28ba6ad2 100644
--- a/Lib/asyncio/proactor_events.py
+++ b/Lib/asyncio/proactor_events.py
@@ -232,8 +232,8 @@ 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))
+            raise TypeError('data argument must be a bytes-like object, not %r' %
+                            type(data).__name__)
         if self._eof_written:
             raise RuntimeError('write_eof() already called')