Comment 3 for bug 1091028

This is pyparsing CHANGE LOG:
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Change Log
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Version 2.0.0 - November, 2012
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- Rather than release another combined Python 2.x/3.x release
  I've decided to start a new major version that is only
  compatible with Python 3.x (and consequently Python 2.7 as
  well due to backporting of key features). This version will
  be the main development path from now on, with little follow-on
  development on the 1.5.x path.

- Operator '<<' is now deprecated, in favor of operator '<<=' for
  attaching parsing expressions to Forward() expressions. This is
  being done to address precedence of operations problems with '<<'.
  Operator '<<' will be removed in a future version of pyparsing.