python提取json字符串的值

json_str={
    "actor":"鄧超",
    "age":35,
    "book":[
        "英語",
        "數學",
        "美術"
    ],
    "children":[
        {
            "name":"等等",
            "age":7,
            "sex":"male"
        },
        {
            "name":"花花",
            "age":3,
            "sex":"female"
        }
    ]
}



#獲取actor 的值
actor=json_str['actor']
#獲取 book 的第二個值
book_2=json_str['book'][1]
#獲取第二個孩子的性別
sex2=json_str['children'][1]['sex']