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diff --git a/src/pyinterp.h b/src/pyinterp.h
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+/*
+ * Copyright (c) 2003-2009, John Wiegley.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of New Artisans LLC nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _PYINTERP_H
+#define _PYINTERP_H
+
+#include "session.h"
+
+#if defined(HAVE_BOOST_PYTHON)
+
+namespace ledger {
+
+class python_interpreter_t : public session_t
+{
+public:
+  python::dict main_nspace;
+  bool is_initialized;
+
+  python_interpreter_t()
+    : session_t(), main_nspace(), is_initialized(false) {
+    TRACE_CTOR(python_interpreter_t, "");
+  }
+  
+  virtual ~python_interpreter_t() {
+    TRACE_DTOR(python_interpreter_t);
+
+    if (is_initialized)
+      Py_Finalize();
+  }
+
+  void initialize();
+  void hack_system_paths();
+
+  python::object import_into_main(const string& name);
+  python::object import_option(const string& name);
+
+  enum py_eval_mode_t {
+    PY_EVAL_EXPR,
+    PY_EVAL_STMT,
+    PY_EVAL_MULTI
+  };
+
+  python::object eval(std::istream& in,
+		      py_eval_mode_t mode = PY_EVAL_EXPR);
+  python::object eval(const string& str,
+		      py_eval_mode_t mode = PY_EVAL_EXPR);
+  python::object eval(const char * c_str,
+		      py_eval_mode_t mode = PY_EVAL_EXPR) {
+    string str(c_str);
+    return eval(str, mode);
+  }
+
+  value_t python_command(call_scope_t& scope);
+  value_t server_command(call_scope_t& args);
+
+  class functor_t {
+    functor_t();
+
+  protected:
+    python::object func;
+
+  public:
+    string name;
+
+    functor_t(python::object _func, const string& _name)
+      : func(_func), name(_name) {
+      TRACE_CTOR(functor_t, "python::object, const string&");
+    }
+    functor_t(const functor_t& other)
+      : func(other.func), name(other.name) {
+      TRACE_CTOR(functor_t, "copy");
+    }
+    virtual ~functor_t() throw() {
+      TRACE_DTOR(functor_t);
+    }
+    virtual value_t operator()(call_scope_t& args);
+  };
+
+  option_t<python_interpreter_t> * lookup_option(const char * p);
+
+  virtual expr_t::ptr_op_t lookup(const symbol_t::kind_t kind,
+				  const string& name);
+
+  OPTION_(python_interpreter_t, import_, DO_(scope) {
+      interactive_t args(scope, "ss");
+      parent->import_option(args.get<string>(1));
+    });
+};
+
+extern shared_ptr<python_interpreter_t> python_session;
+
+} // namespace ledger
+
+#endif // HAVE_BOOST_PYTHON
+
+#endif // _PYINTERP_H