>> made Session.meta a property (maybe just remove the 2 comments would have been enough)

Author: alixdamman

larray/core/session.py

@@ -95,6 +95,24 @@ def __init__(self, *args, **kwargs):
         else:
             self.add(*args, **kwargs)
 
+    @property
+    def meta(self):
+        r"""Returns metadata of the session.
+
+        Returns
+        -------
+        Metadata:
+            Metadata of the session.
+        """
+        return self._meta
+
+    @meta.setter
+    def meta(self, meta):
+        if not isinstance(meta, (list, dict, OrderedDict, Metadata)):
+            raise TypeError("Expected list of pairs or dict or OrderedDict or Metadata object "
+                            "instead of {}".format(type(meta).__name__))
+        object.__setattr__(self, '_meta', meta if isinstance(meta, Metadata) else Metadata(meta))
+
     # XXX: behave like a dict and return keys instead?
     def __iter__(self):
         return iter(self.values())
@@ -303,22 +321,15 @@ def __setitem__(self, key, value):
     def __delitem__(self, key):
         del self._objects[key]
 
-    # TODO: add a a meta property when Python 2.7 will be dropped
     def __getattr__(self, key):
-        if key == 'meta':
-            return self._meta
-        elif key in self._objects:
+        if key in self._objects:
             return self._objects[key]
         else:
             raise AttributeError("'{}' object has no attribute '{}'".format(self.__class__.__name__, key))
 
-    # TODO: implement meta.setter when Python 2.7 will be dropped
     def __setattr__(self, key, value):
         if key == 'meta':
-            if not isinstance(value, (list, dict, OrderedDict, Metadata)):
-                raise TypeError("Expected list of pairs or dict or OrderedDict or Metadata object "
-                                "instead of {}".format(type(value).__name__))
-            object.__setattr__(self, '_meta', value if isinstance(value, Metadata) else Metadata(value))
+            super().__setattr__(key, value)
         else:
             self._objects[key] = value