--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/@pyobject/subsasgn.m	Fri Jul 29 12:39:07 2016 -0700
@@ -0,0 +1,113 @@
+## Copyright (C) 2016 Colin B. Macdonald
+##
+## This file is part of Pytave.
+##
+## Pytave 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}}
+## @defopx Operator @@pyobject {@var{x}@{@var{i}, @var{j}, @dots{}@} =} {@var{rhs}}
+## @defopx Operator @@pyobject {@var{x}@{@var{a}@} =} {@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
+
+      ## Subtract one from index: do this for lists, numpy arrays, etc
+      pyexec ("import collections")
+      pyexec ("import numpy")
+      x_is_list = pycall (pyeval (
+        "lambda (x): isinstance(x, (collections.Sequence, numpy.ndarray))"),
+        x);
+      for i = 1:length (idx.subs)
+        j = idx.subs{i};
+        if (x_is_list && isindex (j) && isnumeric (j))
+          idx.subs{i} = cast (j, class (sizemax ())) - 1;
+        endif
+      endfor
+
+      if (isscalar (idx.subs))
+        ind = idx.subs{1};
+      else
+        error ("not implemented, waiting on #26, #27")
+      endif
+
+      xsi = pycall ("getattr", x, "__setitem__");   # x.__setitem__
+      pycall (xsi, ind, rhs);
+      r = x;
+
+    otherwise
+      idx
+      rhs
+      error ("@pyobject/subsasgn: not implemented")
+  endswitch
+endfunction
+
+
+%!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")
+
+%!test
+%! % dict assignment, adding new keys
+%! pyexec ("d = dict()")
+%! d = pyobject.fromPythonVarName ("d");
+%! d{"a"} = 3;
+%! d{"b"} = 4;
+%! assert (d{"a"}, 3)
+%! assert (d{"b"}, 4)
+
+%!test
+%! % dict assignment, update existing key
+%! pyexec ("d = {'a':1}")
+%! d = pyobject.fromPythonVarName ("d");
+%! d{"a"} = 3;
+%! assert (d{"a"}, 3)
+
+%!test
+%! % dict assignment, other keys (e.g., Issue #10).
+%! pyexec ("d = dict()")
+%! d = pyobject.fromPythonVarName ("d");
+%! d{"5"} = 10;
+%! d{5.5} = 11;
+%! d{5} = 12;
+%! assert (d{"5"}, 10)
+%! assert (d{5.5}, 11)
+%! assert (d{5}, 12)