data_json = data_json['data'] NameError: name 'data_json' is not defined

抱歉，我之前的回答有误。错误是因为`data_json`变量没有在代码中定义。请将以下代码块中的`data_json`变量定义并赋值为API返回的JSON数据：

import requests
import os

get_url = 'https://www.dbbqb.com/api/search/json?'
params = {
    'size': 100
}

headers = {
    "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36"
}

response = requests.get(url=get_url, params=params, headers=headers)
data_json = response.json()

data_json = data_json['data']

pic_paths = []
for detail_data in data_json:
    pic_path = detail_data.get('path')
    pic_paths.append(pic_path)

if not os.path.exists('./表情包'):
    os.makedirs('./表情包')

for pic_url in pic_paths:
    url = 'https://image.dbbqb.com/' + pic_url
    pic_name = pic_url.split('/')[-1]

    response = requests.get(url=url, headers=headers).content
    with open(f'./表情包/{pic_name}.jpg', 'wb') as f:
        f.write(response)
    print(f'{pic_name}.jpg下载完成')

请确保您已经安装了`requests`库，并且网络连接正常。如果问题仍然存在，请提供错误信息以便我更好地帮助您解决问题。