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compare singletons by identity not equality (closes #16712)

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Patch from Serhiy Storchaka.
This commit is contained in:
Benjamin Peterson 2012-10-09 11:16:03 -04:00
parent a511935151
commit b29614e047
9 changed files with 15 additions and 15 deletions
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2
Lib/os.py
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@ -985,7 +985,7 @@ def popen(cmd, mode="r", buffering=-1):
raise TypeError("invalid cmd type (%s, expected string)" % type(cmd))
if mode not in ("r", "w"):
raise ValueError("invalid mode %r" % mode)
if buffering == 0 or buffering == None:
if buffering == 0 or buffering is None:
raise ValueError("popen() does not support unbuffered streams")
import subprocess, io
if mode == "r":