如何在python中使用pandas从动态JSON对象中获取所有键

import pandas as pd
import json

def get_all_keys(json_obj):
    keys = set()
    if isinstance(json_obj, dict):
        keys.update(json_obj.keys())
        for value in json_obj.values():
            keys.update(get_all_keys(value))
    elif isinstance(json_obj, list):
        for item in json_obj:
            keys.update(get_all_keys(item))
    return keys

json_data = '{"key1": "value1", "key2": {"subkey1": "subvalue1", "subkey2": "subvalue2"}, "key3": ["item1", "item2"]}'
python_obj = json.loads(json_data)

keys = get_all_keys(python_obj)

keys_series = pd.Series(list(keys))