In a message of Sat, 11 Jul 2015 23:46:56 -0400, Michelle Meiduo Wu writes: >Thanks a lot! > >Do you know anything about HappyBase compared with Jython? > >Best, >Michelle
I don't know anything at all about HappyBase, and next to nothing about Hadoop. But I know quite a bit about Jython. The Python you get from python.org (and from ActiveState) is written in the C programming language. That is why some of us often call it CPython. However, there are other implementations of Python that are not written in C, and one of them is called Jython. Jython is the Python Programming lanaguage written in Java. Now, in the Greater Python Programming World, most libraries you would like to import and include in your own programs are written in Python itself. They will be perfectly happy running under CPython or under Jython. There are also a whole lot of libraries that are written in C. Getting other things written in C to talk to CPython is work, but it is a pretty straight forward business to wrap your C libraries and getting them to work with CPython. Getting something written in some other language than C to work with CPython is much harder. C++ libraries get wrapped often enough that we have standard ways of doing that, too, but it is a lot more work. And C++ is, by design, a whole lot like C. It is very rare that CPython developers bother to wrap something written in any other language at all. So the world is full of perfectly great libraries written in Java and the CPython world basically never uses them because going from the Java world to the C world is even harder. On the Java side things are similar. If you like your Java world, but want Python syntax, not Java syntax -- you would like to program in Python -- you use Jython. If you want to use a library and it is written in Python, you import that, and it just works. If you want to use a library and it is written in Java, usually -- not all of the time, but most of the time -- you can wrap it very easily, import it, and it works. And if you want to use a C or a C++ library, things get harder. But your goal here is to talk to apache HBase, and that is a java library. Somebody wanted that enough that they made CPython bindings for that, and that is called Thrift, and all I know about that is that it was so hard to use and error prone that the HappyBase developers wrote HappyBase to wrap Thrift in something easier to use. If you want to develop in CPython this is probably where you will end up. (But somebody tomorrow could come by with information on a library I have never heard of, of course.) The other way to go after this is to develop your code with Jython not CPython. Then you follow the instructions here: http://wiki.apache.org/hadoop/Hbase/Jython and you are good to go. You just write to Hbase directly using Python syntax. The next thing you need to do is see what other libraries you need to use for your work, and see if they exist for Jython. For instance, if you need NumPy, you cannot use Jython at this time. People are working on this problem over here: http://jyni.org/ where they are trying to build a better way to interface Jython with C and C++ programs, but they aren't close to being done yet. Laura _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
