Pendulum examples don't work

Steps to reproduce

virtualenv -p $(which python3) env
. ./env/bin/activate
pip install h5py gym keras-rl tensorflow
git clone https://github.com/keras-rl/keras-rl.git
cd keras-rl
python examples/ddpg_pendulum.py

• Alternatively you can install keras-rl with python setup.py install. Same result
• Same result with either python 2 or 3
• The same result happens with examples/naf_pendulum.py.

Actual Result

Using TensorFlow backend.
Traceback (most recent call last):
  File "examples/ddpg_pendulum.py", line 14, in <module>
    gym.undo_logger_setup()
AttributeError: 'module' object has no attribute 'undo_logger_setup'

Expected Result

This

Workaround

Just commenting out that offending line seems to work.

gym.undo_logger_setup()

I’m new to gym. I don’t know how essential that line is. Should I just submit a pull request with that line removed?

Other Info

pip list

Package             Version   
------------------- ----------
absl-py             0.6.1     
astor               0.7.1     
certifi             2018.10.15
chardet             3.0.4     
future              0.17.1    
gast                0.2.0     
grpcio              1.16.0    
gym                 0.10.9    
h5py                2.8.0     
idna                2.7       
Keras               2.2.4     
Keras-Applications  1.0.6     
Keras-Preprocessing 1.0.5     
keras-rl            0.4.2     
Markdown            3.0.1     
numpy               1.15.4    
pip                 18.1      
protobuf            3.6.1     
pyglet              1.3.2     
PyYAML              4.2b4     
requests            2.20.0    
scipy               1.1.0     
setuptools          40.5.0    
six                 1.11.0    
tensorboard         1.12.0    
tensorflow          1.12.0    
termcolor           1.1.0     
urllib3             1.24.1    
Werkzeug            0.14.1    
wheel               0.32.2

[DarrellBest]

Still having this bug in 2020

[ppranonymous]

Same error