old_contents: from matplotlib import pyplot as plt
  import numpy as np
  import os
  import pandas as pd
  
  data_files = "./data"
  
  def movingAv(interval, window_size):
    window = np.ones(int(window_size))/float(window_size)
    return np.convolve(interval, window, 'same')
  
  fig,ax = plt.subplots()
  for subdir, dirs, files in os.walk(data_files):
    for fname in files:
      if fname.endswith(('.csv')):
        x,y = np.loadtxt("data/%s" % fname, unpack = True, delimiter = ',', skiprows = 1)
        y_av = movingAv(y, 200)
        ax.plot(x,y_av)
        ax.plot(x,y)
  plt.show()
  
  
new_contents: from matplotlib import pyplot as plt
  import numpy as np
  import os
  # import pandas as pd
  
  data_files = "./data"
  
  def movingAv(interval, window_size):
    window = np.ones(int(window_size))/float(window_size)
    return np.convolve(interval, window, 'same')
  
  fig,ax = plt.subplots()
  for subdir, dirs, files in os.walk(data_files):
    for fname in files:
      if fname.endswith(('.csv')):
        x,y = np.loadtxt("data/%s" % fname, unpack = True, delimiter = ',', skiprows = 1)
        y_av = movingAv(y, 200)
        ax.plot(x,y_av)
        ax.plot(x,y)
  plt.show()
  
  
subject: Comment out pandas because its unused