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-rw-r--r--Lib/subprocess.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index bb7d0dc..3ce0ed1 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -841,7 +841,8 @@ class Popen(object):
if p2cwrite != -1:
self.stdin = io.open(p2cwrite, 'wb', bufsize)
if universal_newlines:
- self.stdin = io.TextIOWrapper(self.stdin, write_through=True)
+ self.stdin = io.TextIOWrapper(self.stdin, write_through=True,
+ line_buffering=(bufsize == 1))
if c2pread != -1:
self.stdout = io.open(c2pread, 'rb', bufsize)
if universal_newlines: