asyncio: Add asyncio.compat module

Move compatibility helpers for the different Python versions to a new
asyncio.compat module.

1 files changed, 3 insertions, 7 deletions

diff --git a/Lib/asyncio/transports.py b/Lib/asyncio/transports.py
index 22df3c7aede..7a28d908e43 100644
--- a/Lib/asyncio/transports.py
+++ b/Lib/asyncio/transports.py
@@ -2,7 +2,7 @@
 
 import sys
 
-_PY34 = sys.version_info >= (3, 4)
+from asyncio import compat
 
 __all__ = ['BaseTransport', 'ReadTransport', 'WriteTransport',
            'Transport', 'DatagramTransport', 'SubprocessTransport',
@@ -94,12 +94,8 @@ class WriteTransport(BaseTransport):
         The default implementation concatenates the arguments and
         calls write() on the result.
         """
-        if not _PY34:
-            # In Python 3.3, bytes.join() doesn't handle memoryview.
-            list_of_data = (
-                bytes(data) if isinstance(data, memoryview) else data
-                for data in list_of_data)
-        self.write(b''.join(list_of_data))
+        data = compat.flatten_list_bytes(list_of_data)
+        self.write(data)
 
     def write_eof(self):
         """Close the write end after flushing buffered data.