add yapf style and apply yapf to format all Python files

This recreates pull request #2192

examples/pybullet/gym/pybullet_envs/deep_mimic/mocap/camera.py

@@ -1,26 +1,28 @@
-import numpy as np 
+import numpy as np
 
 from quaternion import qrot, qinverse
 
 
-def normalize_screen_coordinates(X, w, h): 
-    assert X.shape[-1] == 2
-    # Normalize so that [0, w] is mapped to [-1, 1], while preserving the aspect ratio
-    return X/w*2 - [1, h/w]
+def normalize_screen_coordinates(X, w, h):
+  assert X.shape[-1] == 2
+  # Normalize so that [0, w] is mapped to [-1, 1], while preserving the aspect ratio
+  return X / w * 2 - [1, h / w]
+
 
 def image_coordinates(X, w, h):
-    assert X.shape[-1] == 2
-    # Reverse camera frame normalization
-    return (X + [1, h/w])*w/2
+  assert X.shape[-1] == 2
+  # Reverse camera frame normalization
+  return (X + [1, h / w]) * w / 2
+
 
 def world_to_camera(X, R, t):
-    Rt = qinverse(R)
-    Q = np.tile(Rt, (*X.shape[:-1], 1))
-    V = X - t
-    return qrot(Q, V)
-    
-def camera_to_world(X, R, t):
-    Q = np.tile(R, (*X.shape[:-1], 1))
-    V = X
-    return qrot(Q, V) + t
+  Rt = qinverse(R)
+  Q = np.tile(Rt, (*X.shape[:-1], 1))
+  V = X - t
+  return qrot(Q, V)
 
+
+def camera_to_world(X, R, t):
+  Q = np.tile(R, (*X.shape[:-1], 1))
+  V = X
+  return qrot(Q, V) + t