the compatibility issues between JPython and CPython are because python isn't implemented in itself Didn't say that. Said that self-hosting is one solution (on

the compatibility issues between JPython and CPython are because python isn't implemented in itself Didn't say that. Said that self-hosting is one solution (one Perl 6 uses), not the only one. [Ruby's secret] isn't self hosting, but rather a very comprehensive unit testing suite for the language No, Python also has a comprehensive test suite. The difference between Jython and Ruby is that Jython isn't as well maintained as the Ruby branches. Self-hosting the syntax is an architectural solution which requires zero additional effort to implement syntax upgrades.