add a temp copy of TF agents (until the API stops changing or configs.py are included)

examples/pybullet/gym/pybullet_envs/agents/tools/attr_dict.py

@@ -0,0 +1,54 @@
+# Copyright 2017 The TensorFlow Agents Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Wrap a dictionary to access keys as attributes."""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import contextlib
+
+
+class AttrDict(dict):
+  """Wrap a dictionary to access keys as attributes."""
+
+  def __init__(self, *args, **kwargs):
+    super(AttrDict, self).__init__(*args, **kwargs)
+    super(AttrDict, self).__setattr__('_mutable', False)
+
+  def __getattr__(self, key):
+    # Do not provide None for unimplemented magic attributes.
+    if key.startswith('__'):
+      raise AttributeError
+    return self.get(key, None)
+
+  def __setattr__(self, key, value):
+    if not self._mutable:
+      message = "Cannot set attribute '{}'.".format(key)
+      message += " Use 'with obj.unlocked:' scope to set attributes."
+      raise RuntimeError(message)
+    if key.startswith('__'):
+      raise AttributeError("Cannot set magic attribute '{}'".format(key))
+    self[key] = value
+
+  @property
+  @contextlib.contextmanager
+  def unlocked(self):
+    super(AttrDict, self).__setattr__('_mutable', True)
+    yield
+    super(AttrDict, self).__setattr__('_mutable', False)
+
+  def copy(self):
+    return type(self)(super(AttrDict, self).copy())