<p>当我或我的学生为获得一个深度嵌套的值而挣扎时,我经常通过它来确保我得到了,看到了我所期望的。正如一些评论者所指出的,您的第二个版本可以正常工作,所以在原始代码中一定有一些我们看不到的细微差别。以下是您关心的关键:</p>
<pre><code>In [45]: update = {'message': {'caption_entities': [],
...: 'channel_chat_created': False,
...: 'chat': {'first_name': 'Rodrigo Formighieri',
...: 'id': 446924384,
...: 'type': 'private',
...: 'username': 'rodrigoformi'},
...: 'date': 1516040454,
...: 'delete_chat_photo': False,
...: 'entities': [{'length': 7, 'offset': 0, 'type': 'bot_command'}],
...: 'from': {'first_name': 'Rodrigo Formighieri',
...: 'id': 446924384,
...: 'is_bot': False,
...: 'language_code': 'pt-BR',
...: 'username': 'rodrigoformi'},
...: 'group_chat_created': False,
...: 'message_id': 145,
...: 'new_chat_member': None,
...: 'new_chat_members': [],
...: 'new_chat_photo': [],
...: 'photo': [],
...: 'supergroup_chat_created': False,
...: 'text': '/invite'},
...: 'update_id': 241263441}
...:
In [46]: update['message']
Out[46]:
{'caption_entities': [],
'channel_chat_created': False,
'chat': {'first_name': 'Rodrigo Formighieri',
'id': 446924384,
'type': 'private',
'username': 'rodrigoformi'},
'date': 1516040454,
'delete_chat_photo': False,
'entities': [{'length': 7, 'offset': 0, 'type': 'bot_command'}],
'from': {'first_name': 'Rodrigo Formighieri',
'id': 446924384,
'is_bot': False,
'language_code': 'pt-BR',
'username': 'rodrigoformi'},
'group_chat_created': False,
'message_id': 145,
'new_chat_member': None,
'new_chat_members': [],
'new_chat_photo': [],
'photo': [],
'supergroup_chat_created': False,
'text': '/invite'}
In [47]: update['message']['from']
Out[47]:
{'first_name': 'Rodrigo Formighieri',
'id': 446924384,
'is_bot': False,
'language_code': 'pt-BR',
'username': 'rodrigoformi'}
In [48]: update['message']['from']['is_bot']
Out[48]: False
</code></pre>