字典方法

1.字典  user = {"name": "cos", "age": 18, "sex": "Man"}  # 索引  # print (user["name"])  # 字典不能分片  # 循环，默认输出key  for i in user:      print (i)

  # 删除  del user["name"]  print (user)

2.clear 清除字典中所有的项

  user = {"name": "cos", "age": 18, "sex": "Man"}  user.clear()  print (user)

3.get 根据Key获取值

  user = {"name": "cos", "age": 18, "sex": "Man"}  print (user.get("age"))

4.has_key 检查字典中是否有特定的键 （ps:在python3.0以后没有has_key)

  user = {"name": "cos", "age": 18, "sex": "Man"}  print (user.has_key("age"))

5.keys、values、items

  user = {"name": "cos", "age": 18, "sex": "Man"}  # 获取键Key  print (user.keys())  # 获取值  print (user.values())  #获取键值  print (user.items())

6.pop 获取给定Key的值，然后将这个键值删除

  user = {"name": "cos", "age": 18, "sex": "Man"}  print (user.pop("name"))  print (user)

7.popitem 随机获取字典的键值，并删除它

  user = {"name": "cos", "age": 18, "sex": "Man"}  print (user.popitem())  print (user)

8.update 利用一个字典更新另一个字典，若Key键相同，则直接覆盖，不同就添加

  user = {"name": "cos", "age": 18, "sex": "Man"}  n = {"name": "sin"}  user.update(n)  print (user)