title: Slack api returns `is_bot`: False for a bot. How else to check if an user is bot?
body: <p><code>slackbot</code> might be dear to slack, but still he's a bot isn't he?</p>
  
  <p>using <a href="https://github.com/slackapi/python-slackclient" rel="noreferrer">python-slackclient</a> I did. <code>slack_client.api_call("users.list")</code></p>
  
  <p><code>
      users = self.slack_client.api_call("users.list")
      for member in users["members"]:
          print(member)
  </code></p>
  
  <p>Prints this for <code>slackbot</code>:</p>
  
  <p><code>{'is_owner': False, 'tz_offset': -28800, 'is_ultra_restricted': False, 'tz': None, 'profile': {'image_48': 'https://a.slack-edge.com/2fac/plugins/slackbot/assets/service_48.png', 'image_192': 'https://a.slack-edge.com/66f9/img/slackbot_192.png', 'avatar_hash': 'sv1444671949', 'fields': None, 'image_32': 'https://a.slack-edge.com/2fac/plugins/slackbot/assets/service_32.png', 'image_512': 'https://a.slack-edge.com/1801/img/slackbot_512.png', 'image_72': 'https://a.slack-edge.com/0180/img/slackbot_72.png', 'image_24': 'https://a.slack-edge.com/0180/img/slackbot_24.png', 'real_name': 'slackbot', 'first_name': 'slackbot', 'last_name': '', 'real_name_normalized': 'slackbot'}, 'status': None, 'team_id': 'T2YJG4LLV', 'name': 'slackbot', 'tz_label': 'Pacific Standard Time', 'is_restricted': False, 'id': 'USLACKBOT', 'color': '757575', 'is_bot': False, 'is_primary_owner': False, 'is_admin': False, 'deleted': False, 'real_name': 'slackbot'}</code></p>
  
  <p>Notice, <code>'is_bot': False</code>. How do I reliably check if a user is a bot. I used to check if the user profile information had <code>email</code> field in it, will that do?</p>