old_contents: import sys, os
  import numpy as np
  import pandas as pd
  import datetime
  
  if __name__ == '__main__':
      infile = sys.argv[1]
      csv_content = pd.read_csv(infile, [0])
  
new_contents: import sys, os
  import numpy as np
  import pandas as pd
  import datetime
  
  if __name__ == '__main__':
      infile = sys.argv[1]
      csv_content = pd.read_csv(infile, [0])
      date = []
  
subject: update extract_samples.py