code: def tmybasename(usaf):
      
      url_file = open(env.SRC_PATH + '/tmy3.csv')
      for line in url_file.readlines():
          if line.find(usaf) is not -1:
              return line.rstrip().partition(',')[0]
docs: Basename for USAF base.
  
      Args:
          usaf (str): USAF code
  
      Returns:
          (str)