Python3解析json返回KeyError：

import json

data = '{"name": "John", "age": 30}'
parsed_data = json.loads(data)

if "name" in parsed_data:
    print(parsed_data["name"])
else:
    print("Key 'name' does not exist")

# 或者使用get()方法
name = parsed_data.get("name")
if name is not None:
    print(name)
else:
    print("Key 'name' does not exist")

import json

data = '{"person": {"name": "John", "age": 30}}'
parsed_data = json.loads(data)

if "person" in parsed_data:
    person = parsed_data["person"]
    if "name" in person:
        print(person["name"])
    else:
        print("Key 'name' does not exist")
else:
    print("Key 'person' does not exist")

# 或者使用try-except块
try:
    person = parsed_data["person"]
    name = person["name"]
    print(name)
except KeyError:
    print("Key does not exist")

import json

data = '{"name": "John", "age": 30}'
parsed_data = json.loads(data)

name = parsed_data.get("name", "Default Name")
print(name)

# 如果键不存在，则返回默认值
address = parsed_data.get("address", "Default Address")
print(address)