to set new power environment if power environment was already initialized.
In this case the function will return -1 unless the environment is unset first
(using ``rte_power_unset_env``). Other function usage scenarios will not change.
+
+* python: Since the beginning of 2020, Python 2 has officially reached
+ end-of-support: https://www.python.org/doc/sunset-python-2/.
+ Python 2 support will be completely removed in 20.11.
+ In 20.08, explicit deprecation warnings will be displayed when running
+ scripts with Python 2.