From c4c263a85ba691bb3eab8637e5ab7f52667c59e4 Mon Sep 17 00:00:00 2001
From: st7105 <st7105@gmail.com>
Date: Tue, 9 Jul 2019 16:40:05 +0700
Subject: [PATCH] Use flush() only if it exists (#1227)

---
 telethon/client/downloads.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/telethon/client/downloads.py b/telethon/client/downloads.py
index 5f14ceab..67388e44 100644
--- a/telethon/client/downloads.py
+++ b/telethon/client/downloads.py
@@ -439,7 +439,10 @@ class DownloadMethods:
                     if inspect.isawaitable(r):
                         await r
 
-            f.flush()
+            # Not all IO objects have flush (see #1227)
+            if callable(getattr(f, 'flush', None)):
+                f.flush()
+
             if in_memory:
                 return f.getvalue()
         finally: