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字典方法

2024-08-15 08:44:46   212人阅读

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)






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