On 20 Jul 2013, at 12:02 AM, Massimo Di Pierro <massimo.dipie...@gmail.com> 
wrote:
> As Jonathan says the ast module was introduced in Pyhton 2.6, you have 2.5.

I was bitten by this (other features, not ast) just yesterday. My local 
environment (OS X) has 2.7; my production environment (RHEL6) had 2.6. Turns 
out that 2.6 does not support collections.Counter (no surprise there, really). 
More surprising, it doesn't support the flags argument to re.sub(). Huh? Easy 
to work around, but still...

When I set up the servers, I started by installing 2.7.latest, but ran into 
some conflicts that I don't recall the details of right now, and reverted to 
the system-supplied 2.6. One of these days I'll have to set up a fresh server 
and figure out what it takes to run 2.7.

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