input: def validate_mail_list(mail_list):
      """Validate a list of emails. The function should return a boolean indicating whether a given email address is valid.
      >>> validate_mail_list(["example.user@gmail.com", "bad@example"])
      False
      >>> validate_mail_list(["example.user@gmail.com", "good.user@example.com"])
      True
      """
output:     import re
      pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
      for email in mail_list:
          if not re.match(pattern, email):
              return False
      return True