Remove future imports (#6724)

* Remove all __future__ imports from RLlib.

* Remove (object) again from tf_run_builder.py::TFRunBuilder.

* Fix 2xLINT warnings.

* Fix broken appo_policy import (must be appo_tf_policy)

* Remove future imports from all other ray files (not just RLlib).

* Remove future imports from all other ray files (not just RLlib).

* Remove future import blocks that contain `unicode_literals` as well.
Revert appo_tf_policy.py to appo_policy.py (belongs to another PR).

* Add two empty lines before Schedule class.

* Put back __future__ imports into determine_tests_to_run.py. Fails otherwise on a py2/print related error.

python/ray/autoscaler/autoscaler.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import copy
 import hashlib
 import json

python/ray/autoscaler/aws/config.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from distutils.version import StrictVersion
 import json
 import os

python/ray/autoscaler/aws/node_provider.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import random
 import threading
 from collections import defaultdict

python/ray/autoscaler/commands.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import copy
 import hashlib
 import json

python/ray/autoscaler/docker.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import os
 import logging
 try:  # py3

python/ray/autoscaler/gcp/config.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import os
 import logging
 import time

python/ray/autoscaler/gcp/node_provider.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from uuid import uuid4
 from threading import RLock
 import time

python/ray/autoscaler/kubernetes/__init__.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import kubernetes
 from kubernetes.config.config_exception import ConfigException
 

python/ray/autoscaler/kubernetes/config.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import logging
 
 from kubernetes import client

python/ray/autoscaler/kubernetes/node_provider.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import logging
 
 from ray.autoscaler.kubernetes import core_api, log_prefix

python/ray/autoscaler/local/config.py

@@ -1,7 +1,2 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
-
 def bootstrap_local(config):
     return config

python/ray/autoscaler/local/node_provider.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from filelock import FileLock
 from threading import RLock
 import json

python/ray/autoscaler/log_timer.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import datetime
 import logging
 

python/ray/autoscaler/node_provider.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import importlib
 import logging
 import os

python/ray/autoscaler/tags.py

@@ -1,9 +1,5 @@
 """The Ray autoscaler uses tags/labels to associate metadata with instances."""
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 # Tag for the name of the node
 TAG_RAY_NODE_NAME = "ray-node-name"
 

python/ray/autoscaler/updater.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 try:  # py3
     from shlex import quote
 except ImportError:  # py2