docs: def _attach_files(filepaths, email_):
      """Take a list of filepaths and attach the files to a MIMEMultipart.
  
      Args:
          filepaths (list(str)): A list of filepaths.
          email_ (email.MIMEMultipart): A MIMEMultipart email_.
      """
      for filepath in filepaths:
          base = os.path.basename(filepath)
          with open(filepath, "rb") as file:
              part = MIMEApplication(file.read(), Name=base)
              part["Content-Disposition"] = 'attachment; filename="%s"' % base
              email_.attach(part)