Serhiy Storchaka added the comment:

It is not so easy. The problem is that we have to determine the print command 
by configuration line. A user may wish to change these settings, and some users 
already changed them. The patch should not break them. For backward 
compatibility we also have to run a command with a shell, not directly. A 
method of quoting of command arguments varies in the different systems and it 
differs from Python's repr. The new code should work in case if the user has 
not changed the default settings, and in case he changed them (for example when 
he replaced %%s to "%%s"). Definitely, this is not an easy issue.

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keywords:  -easy

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16829>
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