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