--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/@pyobject/subsasgn.m	Mon Jul 25 15:42:17 2016 -0700
@@ -0,0 +1,69 @@
+## Copyright (C) 2016 Colin B. Macdonald
+##
+## This file is part of PyTave.
+##
+## OctSymPy 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 software 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 software; see the file COPYING.
+## If not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @documentencoding UTF-8
+## @defop  Method   @@pyobject subsasgn (@var{x}, @var{idx}, @var{rhs})
+## @defopx Operator @@pyobject {@var{x}.@var{property} =} {@var{rhs}}
+## @defopx Operator @@pyobject {@var{x}@{@var{i}@} =} {@var{rhs}}
+## Indexed assignment to Python objects.
+##
+## @seealso{@@pyobject/subsref}
+## @end defop
+
+function r = subsasgn(x, idx, rhs)
+
+  switch idx.type
+    case "."
+      assert (ischar (idx.subs))
+      pycall ("setattr", x, idx.subs, rhs);
+      r = x;
+
+    case "{}"
+      ## XXX: doesn't support slices or anything like that yet
+      assert (length (idx.subs) == 1)
+      assert (isnumeric (idx.subs{1}))
+      ## x.getattr, but for https://github.com/cbm755/octsympy/issues/17
+      xsi = pycall ("getattr", x, "__setitem__");
+      ## 1-based indexing, https://bitbucket.org/mtmiller/pytave/issues/8
+      i = int32 (idx.subs{:}) - 1;
+      pycall (xsi, i, rhs);
+      r = x;
+
+    otherwise
+      idx
+      rhs
+      error ("@pyobject/subsasgn: not implemented")
+  end
+end
+
+
+%!test
+%! pyexec ("class MyClass: a = 1")
+%! t = pyeval ("MyClass()");
+%! t.b = 6;
+%! assert (t.b, 6)
+
+%!test
+%! % list indexing
+%! pyexec ("L = [10, 20]")
+%! L = pyobject.fromPythonVarName ("L");
+%! L{2} = "Octave";
+%! assert (length (L) == 2)
+%! assert (L{1}, 10)
+%! assert (L{2}, "Octave")