Python 3.x compatibility issues

[b0b3rt]

Code requires:
from functools import reduce #py2.7 reduce > py3.x functools.reduce
s/xrange/range #py2.7 xrange > py3.x range

Issue after those are fixed:

Traceback (most recent call last):
  File "main.py", line 70, in <module>
    tf.app.run()
  File "/usr/local/anaconda3/lib/python3.6/site-packages/tensorflow/python/platform/app.py", line 48, in run
    _sys.exit(main(_sys.argv[:1] + flags_passthrough))
  File "main.py", line 62, in main
    agent = Agent(config, env, sess)
  File "/Users/emmanuel.mwangi/open_source/laml/DQN-tensorflow/dqn/agent.py", line 31, in __init__
    self.build_dqn()
  File "/Users/emmanuel.mwangi/open_source/laml/DQN-tensorflow/dqn/agent.py", line 329, in build_dqn
    self._saver = tf.train.Saver(self.w.values() + [self.step_op], max_to_keep=30)
TypeError: unsupported operand type(s) for +: 'dict_values' and 'list'

[GeneDer]

Refer to this: https://stackoverflow.com/questions/43663206/typeerror-unsupported-operand-types-for-dict-values-and-int

Simply convert self.w.values() to list before the sum will do the trick. (i.e. list(self.w.values()))