如何从嵌套字典列表中高效提取price与desc字段？

直接用Python的列表推导式就能高效解决，不用转字符串搜索，代码简洁且可读性高：

基础实现 #

prices = [{'info': {'price': '2.00', 'desc': 'Up'}}, {'info': {'price': '1.50', 'desc': 'Down'}}, {'info': {'price': '3.00', 'desc': 'Down'}}, {'info': {'price': '3.00', 'desc': 'Up'}}, {'info': {'price': '8.40', 'desc': 'Down'}}, {'info': {'price': '14.20', 'desc': 'Down'}}]

# 提取所有price字段
price_list = [item['info']['price'] for item in prices]
# 提取所有desc字段
desc_list = [item['info']['desc'] for item in prices]

# 输出结果
print(price_list)  # ['2.00', '1.50', '3.00', '3.00', '8.40', '14.20']
print(desc_list)   # ['Up', 'Down', 'Down', 'Up', 'Down', 'Down']

容错版（避免键缺失报错） #

如果数据中可能存在缺少info、price或desc键的情况，可以添加条件判断过滤异常项：

price_list = [item['info']['price'] for item in prices if 'info' in item and 'price' in item['info']]
desc_list = [item['info']['desc'] for item in prices if 'info' in item and 'desc' in item['info']]

内容的提问来源于stack exchange，提问作者Folleloide