Python 字典(Dictionary)

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一、字典

字典dict是无序的
字典的存储数据形式 key-value的数据形式

#dir()查看他的方法
data={"name":"lisi","age":20,"work":"测试开发工程师"}
print(dir(data))
'''
'clear', 'copy', 'fromkeys', 'get', 'items', 'keys', 'pop', 'popitem', 'setdefault', 'update', 'values']
name
'''

1 # clear清空
2 data={"name":"lisi","age":20,"work":"测试开发工程师"}
3 data.clear()
4 print(data)

1 #pop删除 并且返回删除的元素
2 data={"name":"lisi","age":20,"work":"测试开发工程师"}
3 print(data.pop("age"))
4 print(data)

1 # copy复制
2 data={"name":"lisi","age":20,"work":"测试开发工程师"}
3 data2=data.copy()
4 print(data2)

1 # update 合并
2 data={"name":"lisi","age":20,"work":"测试开发工程师"}
3 dict1={"sex":"女"}
4 data.update(dict1)
5 print(data)

data={"name":"lisi","age":20,"work":"测试开发工程师"}
#获取所有的key
for key in data.keys():
    print(key)

#获取所有的value
for value in data.values():
    print(value)

#获取key对应的具体的value
data={"name":"lisi","age":20,"work":"测试开发工程师"}
#获取名字
print(data.get("name"))
print(data["name"]) #一般用第二种
#获取工作
print(data["work"])

1 #对字典进行循环
2 data={"name":"lisi","age":20,"work":"测试开发工程师"}
3 for key,value in data.items():
4     print(key,":",value)

#需求:key=="age"并且value==20输出我今年20岁了
data={"name":"lisi","age":20,"work":"测试开发工程师"}
for key,value in data.items():
    if key=="age" and value==20:
        print("我今年20岁了")

二、字典案例实战

1.

 1 data={
 2   "datas": [
 3     {
 4       "author": "wuya",
 5       "done": True,
 6       "id": 1,
 7       "name": "Python接口自动化测试实战"
 8     },
 9     {
10       "author": "无涯",
11       "done": False,
12       "id": 2,
13       "name": "Selenium3自动化测试实战"
14     }
15   ],
16   "msg": "ok",
17   "status": 0
18 }
19 #需求:输出Python接口自动化测试实战
20 print(data["datas"][0]["name"])
21 
22 #需求:输出Selenium3自动化测试实战
23 print(data["datas"][1]["name"])

2.

1 data={"status":0,
2       "msg":"ok",
3       "datas":[
4           {"name":"lisi","age":10},{"name":"god","age":20,"work":["test",{"language":"Python语言"}]}
5       ]
6       }
7 #需求:输出python语言
8 print(data["datas"][1]["work"][1]["language"])

3.

1 data={"status":0,
2       "msg":"ok",
3       "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"}]}]}]
4       }
5 
6 #输出计算机科学与技术
7 print(data["datas"][1]["work"][1]["school"][1]["专业"])

4.

1 data=["language",{"语言":["Go","Python","Java"]}]
2 # 输出结果是:Go,Python,Java
3 print(",".join(data[1]["语言"]))

5.

 1 data1={"status":0,"datas":[{"name":"lisi","score":90},
 2                            {"name":"wangmazi","score":88},
 3                            {"name":"wangwu","score":60},
 4                            {"name":"zhaosi","score":59},
 5                            {"name":"zhaosi","score":29}]}
 6 #需求，对学生成绩进行排序，从低到高排序
 7 listscore=[]
 8 for item in data1["datas"]:
 9     listscore.append(item["score"])
10 listscore.sort()
11 print(listscore)

6.

 1 data2={"status":0,"datas":[
 2   {"name":"lisi","score":90},
 3   {"name":"wangmazi","score":88},
 4   {"name":"wangwu","score":60},
 5   {"name":"zhaosi","score":59}
 6 ]}
 7 #需求：输出lisi,wangmazi,wangwu,zhaosi
 8 listname=[] 
 9 for item in data2["datas"]:
10     listname.append(item["name"])
11 print(",".join(listname))

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