| # Copyright 2018 The TensorFlow Authors. All Rights Reserved. | |
| # | |
| # 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. | |
| # ============================================================================== | |
| """Python context management helper.""" | |
| from __future__ import absolute_import | |
| from __future__ import division | |
| from __future__ import print_function | |
| class IdentityContextManager(object): | |
| """Returns an identity context manager that does nothing. | |
| This is helpful in setting up conditional `with` statement as below: | |
| with slim.arg_scope(x) if use_slim_scope else IdentityContextManager(): | |
| do_stuff() | |
| """ | |
| def __enter__(self): | |
| return None | |
| def __exit__(self, exec_type, exec_value, traceback): | |
| del exec_type | |
| del exec_value | |
| del traceback | |
| return False | |