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diff --git a/python/py_expr.cc b/python/py_expr.cc
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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.
+ */
+
+#include "pyinterp.h"
+#include "pyutils.h"
+#include "expr.h"
+
+namespace ledger {
+
+using namespace boost::python;
+
+namespace {
+  value_t py_expr_call(expr_t& expr)
+  {
+    return expr.calc();
+  }
+}
+
+void export_expr()
+{
+  class_< expr_t > ("Expr")
+    .def(init<string>())
+
+    .def("__nonzero__", &expr_t::operator bool)
+    .def("text", &expr_t::text)
+    .def("set_text", &expr_t::set_text)
+
+    //.def("parse", &expr_t::parse)
+
+    .def("__call__", py_expr_call)
+    .def("compile", &expr_t::compile)
+    //.def("calc", &expr_t::calc)
+
+    .def("is_constant", &expr_t::is_constant)
+
+    //.def("constant_value", &expr_t::constant_value)
+    ;
+}
+
+} // namespace ledger