add yapf style and apply yapf to format all Python files

This recreates pull request #2192

examples/pybullet/gym/pybullet_envs/baselines/enjoy_pybullet_cartpole.py

@@ -2,7 +2,7 @@
 import os, inspect
 currentdir = os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe())))
 parentdir = os.path.dirname(os.path.dirname(currentdir))
-os.sys.path.insert(0,parentdir)
+os.sys.path.insert(0, parentdir)
 
 import gym
 import time
@@ -10,28 +10,29 @@ import time
 from baselines import deepq
 from pybullet_envs.bullet.cartpole_bullet import CartPoleBulletEnv
 
-def main():
-    env = gym.make('CartPoleBulletEnv-v1')
-    act = deepq.load("cartpole_model.pkl")
 
-    while True:
-        obs, done = env.reset(), False
-        print("obs")
-        print(obs)
-        print("type(obs)")
-        print(type(obs))
-        episode_rew = 0
-        while not done:
-            env.render()
-           
-            o = obs[None]
-            aa = act(o)
-            a = aa[0]
-            obs, rew, done, _ = env.step(a)
-            episode_rew += rew
-            time.sleep(1./240.)
-        print("Episode reward", episode_rew)
+def main():
+  env = gym.make('CartPoleBulletEnv-v1')
+  act = deepq.load("cartpole_model.pkl")
+
+  while True:
+    obs, done = env.reset(), False
+    print("obs")
+    print(obs)
+    print("type(obs)")
+    print(type(obs))
+    episode_rew = 0
+    while not done:
+      env.render()
+
+      o = obs[None]
+      aa = act(o)
+      a = aa[0]
+      obs, rew, done, _ = env.step(a)
+      episode_rew += rew
+      time.sleep(1. / 240.)
+    print("Episode reward", episode_rew)
 
 
 if __name__ == '__main__':
-    main()
+  main()