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//# PycImport.cc: Function to import a module and class in Python
//# Copyright (C) 2015
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library is distributed in the hope that it will be useful, but WITHOUT
//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//# Internet email: casa-feedback@nrao.edu.
//# Postal address: AIPS++ Project Office
//# National Radio Astronomy Observatory
//# 520 Edgemont Road
//# Charlottesville, VA 22903-2475 USA
#include <casacore/python/Converters/PycImport.h>
#include <casacore/casa/OS/Path.h>
#if PY_MAJOR_VERSION >= 3
#define IS_PY3K
#endif
namespace casacore { namespace python {
boost::python::object PycImport (const String& moduleName,
const String& className)
{
try {
// Initialize the Python interpreter.
// Note: a second call is a no-op.
Py_Initialize();
// Insert the current working directory into the python path,
// because Boost-Python does not do that.
// (from http://stackoverflow.com/questions/9285384/
// how-does-import-work-with-boost-python-from-inside-python-files)
string workingDir = Path(".").absoluteName();
char path[] = "path"; // warning if "path" is used below
PyObject* sysPath = PySys_GetObject(path);
#ifdef IS_PY3K
PyList_Insert (sysPath, 0, PyUnicode_FromString(workingDir.c_str()));
#else
PyList_Insert (sysPath, 0, PyString_FromString(workingDir.c_str()));
#endif
// First import main.
boost::python::object mainModule = boost::python::import
("__main__");
// Import the given module.
boost::python::object pyModule = boost::python::import
(moduleName.c_str());
// Get the python class object from the imported module.
return pyModule.attr (className.c_str());
} catch (boost::python::error_already_set const &) {
// handle the exception in some way
PyErr_Print();
throw;
}
}
}}
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