Skip Montanaro <[EMAIL PROTECTED]> added the comment:
Using a nonzero bufsize parameter makes all the difference in the world:
Using the default (bufsize=0 ==> unbuffered):
% python popentest.py
time with os.popen : 0.035032
time with subprocess.Popen : 1.496455
Creating the Popen object with bufsize=8192:
% python popentest.py
time with os.popen : 0.034642
time with subprocess.Popen : 0.041376
Creating the Popen object with bufsize=1 (==> line buffered):
% python popentest.py
time with os.popen : 0.034658
time with subprocess.Popen : 0.04211
Maybe the default for that parameter shouldn't be zero?
Skip
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Python tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue4194>
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