Issue #12591: Improve support of "universal newlines" in the subprocess
module: the piped streams can now be properly read from or written to.
(this was broken due to the 2.x to 3.x transition; communicate() support
is still sketchy)
diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index 0523219..ddbca6a 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -721,7 +721,7 @@
if p2cwrite != -1:
self.stdin = io.open(p2cwrite, 'wb', bufsize)
if self.universal_newlines:
- self.stdin = io.TextIOWrapper(self.stdin)
+ self.stdin = io.TextIOWrapper(self.stdin, write_through=True)
if c2pread != -1:
self.stdout = io.open(c2pread, 'rb', bufsize)
if universal_newlines: