从协议缓冲区创建一个类似 Python 字典的对象，以在 Pandas 中使用
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creating a python dictionary like object from protocol buffers for use in pandas
提问by Justin
I currently interface to a server that provides protocol buffers. I can potentially receive a very large number of messages. Currently my process to read the protocol buffers and convert them to a Pandas DataFrame (not a necessary step in general, but Pandas offers nice tools for analyzing datasets) is:
我目前连接到提供协议缓冲区的服务器。我可能会收到大量消息。目前，我读取协议缓冲区并将它们转换为 Pandas DataFrame 的过程（通常不是必要的步骤，但 Pandas 提供了很好的分析数据集的工具）是：
- Read protocol buffer, it will be a google protobuf object
- Convert protocol buffers to dictionary using protobuf_to_dict
- use
pandas.DataFrame.from_recordsto get a DataFrame
- 读取协议缓冲区，它将是一个 google protobuf 对象
- 使用protobuf_to_dict将协议缓冲区转换为字典
- 用于
pandas.DataFrame.from_records获取 DataFrame
This works great, but, given the large number of messages I read from the protobuf, it is quite inefficient to convert to dictionary and then to pandas. My question is: is it possible to make a class that can make a python protobuf object look like a dictionary? That is, remove step 2. Any references or pseudocode would be helpful.
这很好用，但是，考虑到我从 protobuf 中读取的大量消息，转换为字典然后转换为Pandas的效率非常低。我的问题是：是否有可能制作一个可以使 python protobuf 对象看起来像字典的类？也就是说，删除第 2 步。任何引用或伪代码都会有所帮助。
采纳答案by Zheng Xu
You might want to check the ProtoTextpython package. It does provide in-place dict-like operation to access your protobuf object.
您可能需要检查ProtoTextpython 包。它确实提供了类似 dict 的就地操作来访问您的 protobuf 对象。
Example usage:
Assume you have a python protobuf object person_obj.
用法示例：假设您有一个 python protobuf 对象person_obj。
import ProtoText
print person_obj['name'] # print out the person_obj.name
person_obj['name'] = 'David' # set the attribute 'name' to 'David'
# again set the attribute 'name' to 'David' but in batch mode
person_obj.update({'name': 'David'})
print ('name' in person_obj) # print whether the 'name' attribute is set in person_obj
# the 'in' operator is better than the google implementation HasField function
# in the sense that it won't raise Exception even if the field is not defined
