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        "description": "Undoable\n========\n\nA simple Python list (``observed_list``) and dict (``observed_dict``)\nwith callbacks when they are changed and undo/redo using these\ncallbacks.\n\nAlso includes ``observed_tree``, a labelled tree with ordered children\nimplemented as Python list with parent pointers and a bit of consistency\ncheck.\n\nImplementation\n--------------\n\nImplemented using the `command\npattern <https://en.wikipedia.org/wiki/Command_pattern>`__. See `my blog\npost discussing this <https://asrp.github.io/blog/undo-redo.html>`__.\n\nExample\n-------\n\n::\n\n    pip install undoable\n\nCallbacks\n~~~~~~~~~\n\n::\n\n    >>> from undoable import observed_dict, observed_list\n    >>> def printargs(*args):\n    ...     print args\n    ... \n    >>> l = observed_list([1, 2, 3])\n    >>> l.callbacks.append(printargs)\n    >>> l.append(4)\n    ([1, 2, 3, 4], 'append', 4)\n    >>> l.extend([5, 6, 7])\n    ([1, 2, 3, 4, 5, 6, 7], 'extend', [5, 6, 7])\n    >>> d = observed_dict({1: \"one\", 2: \"two\"})\n    >>> d.callbacks.append(printargs)\n    >>> d[3] = \"three\"\n    ({1: 'one', 2: 'two', 3: 'three'}, '__setitem__', 3, 'three')\n    >>> d2 = observed_dict()\n    >>> d2.undocallbacks.append(printargs)\n    >>> d2[1] = \"one\"\n    ({1: 'one'}, ('__delitem__', 1), ('__setitem__', 1, 'one'))\n\nUndo/redo\n~~~~~~~~~\n\n::\n\n    >>> from undoable import UndoLog, observed_dict, observed_list\n    >>> u = UndoLog()\n    >>> d = observed_dict({1: \"one\", 2: \"two\"})\n    >>> l = observed_list([1, 2, 3])\n    >>> u.add(d)\n    >>> u.add(l)\n    >>> l.append(1)\n    >>> d[3] = \"Hello\"\n    >>> l\n    [1, 2, 3, 1]\n    >>> d\n    {1: 'one', 2: 'two', 3: 'Hello'}\n    >>> u.undo()\n    >>> d\n    {1: 'one', 2: 'two'}\n    >>> u.undo()\n    >>> l\n    [1, 2, 3]\n    >>> u.redo()\n    >>> u.redo()\n    >>> l\n    [1, 2, 3, 1]\n    >>> d\n    {1: 'one', 2: 'two', 3: 'Hello'}\n    >>> u.start_group(\"foo\")\n    True\n    >>> d[53] = \"user\"\n    >>> del d[1]\n    >>> u.end_group(\"foo\")\n    >>> d\n    {2: 'two', 3: 'Hello', 53: 'user'}\n    >>> u.undo()\n    >>> d\n    {1: 'one', 2: 'two', 3: 'Hello'}",
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