add new part

treevalue/tree/__init__.py

+from .common import *
+from .tree import *

treevalue/tree/common/tree.py

+from functools import wraps
 from typing import Dict, Any, Union, List
 
 from .base import BaseTree
@@ -5,6 +6,7 @@ from ...utils import init_magic
 
 
 def _to_tree_decorator(init_func):
+    @wraps(init_func)
     def _new_init_func(data):
         if isinstance(data, Tree):
             _new_init_func(data.to_json())

treevalue/tree/tree/__init__.py

+from .tree import TreeValue

treevalue/tree/tree/tree.py

+from functools import wraps
+
+from ..common import BaseTree, Tree
+from ...utils import init_magic
+
+_DATA_PROPERTY = '_property__data'
+_PRESERVED_PROPERTIES = {
+    _DATA_PROPERTY,
+}
+
+
+def _get_data_property(t: 'TreeValue') -> BaseTree:
+    return getattr(t, _DATA_PROPERTY)
+
+
+def _init_decorate(init_func):
+    @wraps(init_func)
+    def _new_init_func(data):
+        if isinstance(data, TreeValue):
+            _new_init_func(_get_data_property(data))
+        elif isinstance(data, dict):
+            _new_init_func(Tree(data))
+        elif isinstance(data, Tree):
+            init_func(data)
+        else:
+            raise TypeError(
+                "Unknown initialization type for tree value - {type}.".format(type=repr(type(data).__name__)))
+
+    return _new_init_func
+
+
+@init_magic(_init_decorate)
+class TreeValue:
+    def __init__(self, data: BaseTree):
+        setattr(self, _DATA_PROPERTY, data)
+
+    def __getattr__(self, key):
+        if key in _PRESERVED_PROPERTIES:
+            return object.__getattribute__(key)
+        else:
+            return _get_data_property(self).__getitem__(key)
+
+    def __setattr__(self, key, value):
+        if key in _PRESERVED_PROPERTIES:
+            object.__setattr__(self, key, value)
+        else:
+            return _get_data_property(self).__setattr__(key, value)
+
+    def __delattr__(self, key):
+        if key in _PRESERVED_PROPERTIES:
+            object.__delattr__(self, key)
+        else:
+            return _get_data_property(self).__delattr__(key)

treevalue/tree/tree/utils.py

+from .tree import TreeValue, _get_data_property
+
+
+def to_json(tree: TreeValue):
+    return _get_data_property(tree).to_json()