- Preparation work for using six or future module for Py2/3 compat. The
code will be written in Python 3 with Python 2 fallbacks.
- Added some Py3 imports with Py2 fallbacks to make it easier to remove
Py2 code in future.
- Replace xrange with range (sort out import as top of files in future).
- Workaround Py2to3 basestring issue with inline if in instances. This means
every usage of basestring is more considered.
- Replace iteritems and itervalues for items and values. There might be a
performance penalty on Py2 so might need to revisit this change.
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