This was done partly as a learning exercise, partly just as a vague idea that might prove to be practical (chatting with Neal at the time, but all blame is with me, not him!)

The following adds 'from __future__ import print_function' to 2.x. When this is enabled, 'print' is no longer a statement. Combined with copying bltinmodule.c:builtin_print() from the p3yk trunk, this should give some compatibility options for 2.6 <-> 3.0

Note that for some reason I don't fully understand, this doesn't work in interactive mode. For some reason, in interactive mode, the parser flags get reset for each line. Wah.