new_contents: """
  A small script that creates a csv file specified by FILENAME in the same folder
  as the script and stores sensor values in it at a high frequency while
  displaying the current sensor value in real time. After pressing ctrl+C, it
  attempts to plot the collected data using numpy and matplotlib, but does
  nothing if these are not available. Might be useful for cailbration.
  """
  
  import sensor
  import os, sys
  import time
  
  if __name__ == "__main__":
    os.chdir(os.path.dirname(__file__))
    FILENAME = "calibration.csv"
    SEP = "," # separator used for csv
  
    try:
      answer = None
      if os.path.exists(FILENAME):
        answer = input("Warning: overwrite file '{}' (y/n)? ".format(FILENAME))
      if answer is not None and "n" in answer:
        print("Quitting. Not overwriting '{}'.".format(FILENAME))
        sys.exit()
  
      elif answer is not None and "y" in answer:
        print("Overwriting '{}'".format(FILENAME))
  
      s = sensor.Sensor()
  
      with open(FILENAME, "w") as f:
        while True:
          #TODO: make this less of a hack (currently copied from __name__ == __main__ section of sensor/__init)
          poll_result = s.poll(averaging_time = 0.01, avg_interval = 0.001) #TODO: adjust these timings
          rawValue = poll_result["rawValue"]
          timestamp = time.time()
          txt = SEP.join([str(rawValue), str(timestamp)]) + "\n"
          f.write(txt)
          fmt = "{:0=10} {:>12.1f}"
          sys.stdout.write(fmt.format(rawValue, timestamp) + "\r")
          sys.stdout.flush()
          time.sleep(0.05)
  
    except KeyboardInterrupt:
      sensor.driver.cleanup()
  
    except Exception:
      sensor.driver.cleanup()
      raise
  
    print("\n\nPlotting data if possible...")
    try:
      import numpy as np
      import matplotlib.pyplot as plt
  
      data = np.loadtxt(FILENAME, delimiter = SEP)
  
      plt.plot(data[:, 0], data[:, 1])
  
      plt.show()
  
    except ImportError as e:
      print("{} not found, not plotting.".format(e.name))
  
  
  
subject: Move old calibrate.py to read_and_plot.py and update description.