code: def read_passwd_file(pass_file):
      
      with open(pass_file) as fin:
          passwd = fin.read().strip()
      return passwd
docs: Read password from external file and retrun as string. The file should
      contain just single line. Prevents hard-coding password anywhere in this
      script. IMPORTANT! Password is stored as plain text! Do NOT use with your
      personal account!"
  
      Args:
          pass_file (str): /path/to/pass_file