1 files changed, 2 insertions, 1 deletions
diff --git a/Lib/os.py b/Lib/os.py
index 4626d1f..67662ca 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -974,7 +974,7 @@ otherwise return -SIG, where SIG is the signal that killed it. """
 # command in a shell can't be supported.
 if sys.platform != 'vxworks':
     # Supply os.popen()
-    def popen(cmd, mode="r", buffering=-1):
+    def popen(cmd, mode="r", buffering=-1, encoding=None):
         if not isinstance(cmd, str):
             raise TypeError("invalid cmd type (%s, expected string)" % type(cmd))
         if mode not in ("r", "w"):
@@ -982,6 +982,7 @@ if sys.platform != 'vxworks':
         if buffering == 0 or buffering is None:
             raise ValueError("popen() does not support unbuffered streams")
         import subprocess, io
+        encoding = io.text_encoding(encoding)
         if mode == "r":
             proc = subprocess.Popen(cmd,
                                     shell=True, text=True,