add yapf style and apply yapf to format all Python files

This recreates pull request #2192

examples/pybullet/gym/pybullet_envs/deep_mimic/DeepMimic_Optimizer.py

@@ -4,11 +4,10 @@ import os
 import 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)
-print("parentdir=",parentdir)
+os.sys.path.insert(0, parentdir)
+print("parentdir=", parentdir)
 
-
-from pybullet_envs.deep_mimic.env.pybullet_deep_mimic_env  import PyBulletDeepMimicEnv
+from pybullet_envs.deep_mimic.env.pybullet_deep_mimic_env import PyBulletDeepMimicEnv
 from pybullet_envs.deep_mimic.learning.rl_world import RLWorld
 from pybullet_utils.logger import Logger
 from pybullet_envs.deep_mimic.testrl import update_world, update_timestep, build_world
@@ -17,36 +16,40 @@ import pybullet_utils.mpi_util as MPIUtil
 args = []
 world = None
 
+
 def run():
-    global update_timestep
-    global world
+  global update_timestep
+  global world
 
-    done = False
-    while not (done):
-        update_world(world, update_timestep)
+  done = False
+  while not (done):
+    update_world(world, update_timestep)
+
+  return
 
-    return
 
 def shutdown():
-    global world
+  global world
+
+  Logger.print2('Shutting down...')
+  world.shutdown()
+  return
 
-    Logger.print2('Shutting down...')
-    world.shutdown()
-    return
 
 def main():
-    global args
-    global world
+  global args
+  global world
 
-    # Command line arguments
-    args = sys.argv[1:]
-    enable_draw = False
-    world = build_world(args, enable_draw)
+  # Command line arguments
+  args = sys.argv[1:]
+  enable_draw = False
+  world = build_world(args, enable_draw)
 
-    run()
-    shutdown()
+  run()
+  shutdown()
+
+  return
 
-    return
 
 if __name__ == '__main__':
-    main()
+  main()