diff --git a/sample.py b/sample.py
index 7200d7a..679f94a 100644
--- a/sample.py
+++ b/sample.py
@@ -1,10 +1,7 @@
-import sys
 import pickle
 import gym
 import numpy as np
 from matplotlib import pyplot as plt
-from matplotlib.animation import FuncAnimation
-from time import sleep
 
 # numpy precision for printing
 np.set_printoptions(precision=3, suppress=True)
@@ -25,7 +22,7 @@ data = []
 for lam in samples:
     breakpoints = []
     score = 0
-    O = []
+    obs = []
     for n in range(max_steps):
         ax.cla()
         # action = env.action_space.sample()
@@ -33,8 +30,8 @@ for lam in samples:
         # action = 1 if observation[0] - observation[3]  < 0 else 0
         observation, reward, done, info = env.step(action)
         score += reward
-        O.append(observation.tolist())
-        o = np.array(O)
+        obs.append(observation.tolist())
+        o = np.array(obs)
         var = np.var(o[-int(score) :, :], axis=0)
         for q in range(4):
             lines = np.hstack([o[:, q], np.zeros(max_steps - n)])
@@ -59,9 +56,8 @@ for lam in samples:
         fig.show()
         fig.canvas.flush_events()
         env.render()
-        # sleep(0.01)
 
-    data.append({"lam": lam, "obs": O, "break": breakpoints})
+    data.append({"lam": lam, "obs": obs, "break": breakpoints})
     pickle.dump(data, open("data.pkl", "wb"))  # dump data frequently
 
 stop = input("Press any key to close.")