diff --git a/pyext/GIntegral.i b/pyext/GIntegral.i
new file mode 100644
index 0000000..a0fa895
--- /dev/null
+++ b/pyext/GIntegral.i
@@ -0,0 +1,77 @@
+/***************************************************************************
+ *                  GIntegral.hpp  -  Integration class                    *
+ * ----------------------------------------------------------------------- *
+ *  copyright (C) 2010-2011 by Jurgen Knodlseder                           *
+ * ----------------------------------------------------------------------- *
+ *                                                                         *
+ *  This program is free software: you can redistribute it and/or modify   *
+ *  it under the terms of the GNU General Public License as published by   *
+ *  the Free Software Foundation, either version 3 of the License, or      *
+ *  (at your option) any later version.                                    *
+ *                                                                         *
+ *  This program 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 General Public License for more details.                           *
+ *                                                                         *
+ *  You should have received a copy of the GNU General Public License      *
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.  *
+ *                                                                         *
+ ***************************************************************************/
+/**
+ * @file GIntegral.hpp
+ * @brief Integration class Python interface definition
+ * @author J. Knodlseder
+ */
+%{
+/* Put headers and other declarations here that are needed for compilation */
+#include "GIntegral.hpp"
+#include "GTools.hpp"
+%}
+
+
+/***********************************************************************//**
+ * @class GIntegral
+ *
+ * @brief Integration class Python interface defintion.
+ *
+ * This class allows to perform integration using various methods. The
+ * integrand is implemented by a derived class of GIntegrand.
+ ***************************************************************************/
+class GIntegral {
+public:
+
+    // Constructors and destructors
+    explicit GIntegral(void);
+    explicit GIntegral(GIntegrand* integrand);
+    GIntegral(const GIntegral& integral);
+    virtual ~GIntegral(void);
+
+    // Methods
+    void              clear(void);
+    GIntegral*        clone(void) const;
+    void              max_iter(const int& max_iter) { m_max_iter=max_iter; }
+    void              eps(const double& eps) { m_eps=eps; }
+    void              silent(const bool& silent) { m_silent=silent; }
+    const int&        iter(void) const { return m_iter; }
+    const int&        max_iter(void) const { return m_max_iter; }
+    const double&     eps(void) const { return m_eps; }
+    const bool&       silent(void) const { return m_silent; }
+    void              integrand(GIntegrand* integrand) { m_integrand=integrand; }
+    const GIntegrand* integrand(void) const { return m_integrand; }
+    double            romb(double a, double b, int k = 5);
+    double            trapzd(double a, double b, int n = 1, double result = 0.0);
+};
+
+
+/***********************************************************************//**
+ * @brief GIntegral class extension
+ ***************************************************************************/
+%extend GIntegral {
+    char *__str__() {
+        return tochar(self->print());
+    }
+    GIntegral copy() {
+        return (*self);
+    }
+};
diff --git a/pyext/GIntegrand.i b/pyext/GIntegrand.i
new file mode 100644
index 0000000..8ed96eb
--- /dev/null
+++ b/pyext/GIntegrand.i
@@ -0,0 +1,66 @@
+/***************************************************************************
+ *       GIntegrand.hpp  -  Integrand function abstract base class         *
+ * ----------------------------------------------------------------------- *
+ *  copyright (C) 2010 by Jurgen Knodlseder                                *
+ * ----------------------------------------------------------------------- *
+ *                                                                         *
+ *  This program is free software: you can redistribute it and/or modify   *
+ *  it under the terms of the GNU General Public License as published by   *
+ *  the Free Software Foundation, either version 3 of the License, or      *
+ *  (at your option) any later version.                                    *
+ *                                                                         *
+ *  This program 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 General Public License for more details.                           *
+ *                                                                         *
+ *  You should have received a copy of the GNU General Public License      *
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.  *
+ *                                                                         *
+ ***************************************************************************/
+/**
+ * @file GIntegrand.hpp
+ * @brief Integrand abstract virtual base class Python interface definition.
+ * @author J. Knodlseder
+ */
+%{
+/* Put headers and other declarations here that are needed for compilation */
+#include "GIntegrand.hpp"
+#include "GTools.hpp"
+%}
+
+
+/***********************************************************************//**
+ * @class GIntegrand
+ *
+ * @brief Integrand class Python interface defintion.
+ *
+ * This class implements the abstract interface for the integration kernel
+ * function. It has no members. The only pure virtual method that has to
+ * be implemented by the derived class is the eval() method that provides
+ * function evaluation at a given value x, e.g. y=eval(x).
+ ***************************************************************************/
+class GIntegrand {
+public:
+
+    // Constructors and destructors
+    GIntegrand(void);
+    GIntegrand(const GIntegrand& arg);
+    virtual ~GIntegrand(void);
+
+    // Methods
+    virtual double eval(double x) = 0;
+
+protected:
+    // Protected methods
+    void init_members(void);
+    void copy_members(const GIntegrand& arg);
+    void free_members(void);
+};
+
+
+/***********************************************************************//**
+ * @brief GIntegrand class extension
+ ***************************************************************************/
+//%extend GIntegrand {
+//};