字典

列表的特点：
1. 可存放多个值
2.按照从左到右的顺序定义列表元素，下标从0开始顺序访问
3. 列表是有序的
4. 列表也是可变化的，也就是说可以根据列表的索引位置来修改列表的值

列表和元组的区别：
list的是可变的；而tuple(元组)刚好,是不可变的，
列表和字典的区别：
列表示有序的；字典是⽆序的，可以使⽤key-value的⽅式来存储数据。
注意事项：当元组里面只有一个元素的时候，一定要加逗号

以data1={"name":"lisa","age":20,"work":"测试开发工程师"}为例：

首先是使用dir 来查看字典的使用方法，

具体代码如下：

data1={"name":"lisa","age":20,"work":"测试开发工程师"}
print(dir(data1))

得到结果为：

 

 1：获取字典中所有的key ,

for key in data1.keys():
    print(key)

得到结果为:

 

 2：获取所有的value，

for  value in data1.values():
    print(value)

得到结果为:

 

 3：对字典的循环，

for key,value in data1.items():
    print(key,":",value)

 

 

key=age,value=20,输出：我今年20岁

for key,value in data1.items():
    print(key,value)
    if key=="age" and  value==20:
        print("我今年20 ")

 

 4.获取key对应的value通常有两种方法，一种是get、一种是data[]。两种方法是等价的。

print(data1.get("name"))
print(data1["name"])
print(data1.get("age"))
print(data1["age"])
print(data1.get("work"))
print(data1["work"])

 

 5.清空

 data1.clear()
print(data1)

 

 6.删除

print(data1.pop("age"))
print(data1)

 

 7.合并

data3={"sex":"女"}
data3.update(data1)
print(data3)

 8、排序

按key排序

dict1={"name":"lisa","age":"20","work":"测试开发工程师","sex":"女","language":"go"}
print(dict(sorted
           (dict1.items(),
            key=lambda i:i[0])))

 

 按velue排序（字典里velue的数据类型必须一致）

dict1={"name":"lisa","age":"20","work":"testdev","sex":"gire","language":"go"}
print(dict(sorted
           (dict1.items(),
            key=lambda i:i[1])))

 

 

'''字符串转列表'''

str1="1,2,3,4

print(str1.split(","))
list7=["1","2","3","4"]

输出结果为['1', '2', '3', '4']

 

'''列表转化字符串'''

list7=["1","2","3","4"]
print(",".join(list7))
输出结果为1,2,3,4

'''列表转元组'''

listtuple=tuple(list7)
print(listtuple)
输出结果为('1', '2', '3', '4')

'''元组转列表'''

tuplelist=list(listtuple)
print(tuplelist)
输出结果为['1', '2', '3', '4']

 

'''列表转化字典'''

list7=["1","2","3","4"]
listdict=dict(enumerate(list7))
print(listdict)
输出结果为{0: '1', 1: '2', 2: '3', 3: '4'}

 

'''字典转化为列表'''

dictlist=list(listdict.values())
print(dictlist)
输出结果为['1', '2', '3', '4']

 

'''分解出N个信息'''

list7=["python",'google','badu','huawei']
language,*company=list7
print(language)
print(company)
输出结果为python
['google', 'badu', 'huawei']

 

 字典实战

data={"datas": [{"author": "wuya","done": True,"id": 1,"name": "Python接口自动化测试实战"},
                {"author": "无涯","done": False,"id": 2,"name": "Selenium3自动化测试实战"}],"msg": "ok","status": 0}
print((data.get("datas")[0]).get("name"))
print(data["datas"][1]["name"])

 

 

data={
   'answer': "你好呀！",
   "answer_type": "text",
   "bid_stat": {
      "curr_time": "20190515-18:07:37",
      "err_msg": "微信通用意图.肯定.branches.s_Any@.arguments's element.slot slot does not exist!",
      "latest_time": "20190523-16:06:33",
      'latest_valid': False,
      "up_ret": -1
   },
   "msg": [
      {
         "ans_node_id": 6666,
         "ans_node_name": "小微闲聊",
         "confidence": 1,
         "content": "你好呀！",
         "debug_info": "",
         "msg_type": "text",
         "resp_title": "小薇兄你好",
         "status": "FAQ"
      }
   ],
   "from_user_name": "o9U-85tEZToQxIF8ht6o-KkagxO0",
   "status": "FAQ",
   "to_user_name": "10808"
}
print(data["msg"][0]["resp_title"])

 

 

data={"status":0,"msg":"ok","datas":[
  {"name":"lisi","age":10},
  {"name":"god","age":20,"work":["test",{"language":"Python语言"}]}]}
print(data["datas"][1]["work"][1]["language"])

 

 

data={"status":0,"msg":"ok","datas":[
  {"name":"lisi","age":10},
  {"name":"god","age":20,"work":["test",{"language":"Python语言","school":["北京大学",{"专业":"计算机科学与技术"}]}]}]}
print(data["datas"][1]["work"][1]["school"][1]["专业"])

 

 

data1={"status":0,"datas":[
  {"name":"lisi","score":90},
  {"name":"wangmazi","score":88},
  {"name":"wangwu","score":60},
  {"name":"zhaosi","score":59},
  {"name":"zhaosi","score":29}
]}

需求，对学生成绩进行排序，从低到高排序

list7=[]
for i in data1["datas"]:
  list7.append(i["score"])
  list7.sort()
print(list7)