code: def read_creds_from_csv(filename):
      
      key_id = None
      secret = None
      mfa_serial = None
      secret_next = False
      with open(filename, 'rt') as csvfile:
          for i, line in enumerate(csvfile):
              values = line.split(',')
              for v in values:
                  if v.startswith('AKIA'):
                      key_id = v.strip()
                      secret_next = True
                  elif secret_next:
                      secret = v.strip()
                      secret_next = False
                  elif re_mfa_serial_format.match(v):
                      mfa_serial = v.strip()
      return key_id, secret, mfa_serial
docs: Read credentials from a CSV file
  
      :param filename:
      :return: