[Haskell-cafe] How to call python from haskell

Dear cafe I had try to use the http://hackage.haskell.org/package/cpython http://hackage.haskell.org/package/cpython package. I can call python function once by the package, but when I call function second time it will occur a "Segmentation fault”. Does there any stable package support call python from haskell? Thanks. Julian