[issue4194] default subprocess.Popen buffer size

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

About Python3, os.popen() is more than two times faster (0.20 sec vs 
0.50 sec) than subprocess.Popen()! It's amazing because popen() opens 
the standard output as unicode file whereas Popen() creates a binary 
file! Another funny thing: os.popen() calls subprocess.Popen() :-) The 
difference is just this instruction:
   stdout = io.TextIOWrapper(stdout)

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nosy: +haypo

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<http://bugs.python.org/issue4194>
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