如何访问json data中的单个数据？

{
  "name": "John",
  "age": 30,
  "email": "john@example.com"
}

data = {
  "name": "John",
  "age": 30,
  "email": "john@example.com"
}

name = data.name
print(name)  # 输出：John

[
  {
    "name": "John",
    "age": 30,
    "email": "john@example.com"
  },
  {
    "name": "Jane",
    "age": 25,
    "email": "jane@example.com"
  }
]

data = [
  {
    "name": "John",
    "age": 30,
    "email": "john@example.com"
  },
  {
    "name": "Jane",
    "age": 25,
    "email": "jane@example.com"
  }
]

name = data[0].name
print(name)  # 输出：John