David M. Beazley <beaz...@users.sourceforge.net> added the comment:

Good luck with that.  Most people who get bright ideas such as "gee, 
maybe I'll write my own version of X" where "X" is some part of the 
standard C library pertaining to I/O, end up fighting a losing battle.   
Of course, I'd love to be proven wrong, but I don't think I will in this 
case. 

As for cranking data, that does not necessarily imply heavy-duty CPU 
processing.  Someone might be reading large datafiles simply to perform 
some kind of data extraction, filtering, minor translation, or other 
operation that is easily carried out in Python, but where the programs 
are still I/O bound.   For example, the kinds of processing one might 
otherwise do using awk, sed, perl, etc.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue4561>
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