commit 42c35d9c0c8175332f50fbe034a001fe52f057b9
author Serhiy Storchaka <storchaka@gmail.com> Sat Feb 24 18:55:51 2018 +0200
committer GitHub <noreply@github.com> Sat Feb 24 18:55:51 2018 +0200
tree 00485d2cfcf5a47eec398a87cd6751f444978733
parent aef1283ba428e33397d87cee3c54a5110861552d

bpo-31966: Fixed WindowsConsoleIO.write() for writing empty data. (GH-5754)

Modules/_io/winconsoleio.c

diff --git a/Modules/_io/winconsoleio.c b/Modules/_io/winconsoleio.c
index 30d1c76..b85c11b 100644
--- a/Modules/_io/winconsoleio.c
+++ b/Modules/_io/winconsoleio.c
@@ -964,6 +964,9 @@
     if (!self->writable)
         return err_mode("writing");
 
+    if (!b->len) {
+        return PyLong_FromLong(0);
+    }
     if (b->len > BUFMAX)
         len = BUFMAX;
     else