text: import os
  import sys
  import csv
  
  ## ------------------------------------------------------------------------
  ## Execution parameters
  
  # https://covid.cdc.gov/covid-data-tracker/#vaccinations
  INPUT_FILE_SUPPLY = "data/covid19_vaccinations_in_the_united_states.csv"
  OUTPUT_FILE_SUPPLY = "out_supply.csv"
  ## ------------------------------------------------------------------------
  
  def main():
  
      with open(INPUT_FILE_SUPPLY) as f:
          lines = f.readlines()
      lines.pop(0) # remove line 1: COVID-19 Vaccinations in the United States
      lines.pop(0) # remove line 2: Date generated: Fri Jun 11 2021 09:21:54 GMT-0400 (Eastern Daylight Time)
  
      lines[0] = lines[0].replace("+","plus")
      lines[0] = lines[0].replace("-","_")
      lines[0] = lines[0].replace(" ","_")
      lines[0] = lines[0].replace("/","_")
  
      with open(OUTPUT_FILE_SUPPLY, 'w') as filehandle:
          filehandle.writelines(d.replace("N/A","") for d in lines)
              
          
  if __name__ == "__main__":
      main()
      
  
  