【人工智能】这次再来练习python中有的dict而Java没有的东西

对于没见过的概念，那我就搜索看看。

Python 中的 dict 是一种内置的数据类型，它代表了一个无序的键值对集合。dict 使用大括号 {} 来定义，并且每个键值对之间用冒号 : 分隔，键值对之间用逗号 , 分隔。字典允许我们通过键（key）快速查找、添加、修改或删除对应的值（value）。键必须是唯一的，并且通常是不可变的类型（如字符串、数字或元组），而值可以是任何数据类型

这看上去有点像json啊

# 创建一个空字典
my_dict = {}

# 创建一个包含键值对的字典
my_dict = {
    'name': 'Alice',
    'age': 25,
    'city': 'New York'
}

好，那我们就来练习一下

# Clase en vídeo: https://youtu.be/Kp4Mvapo5kc

### Dictionaries ###

# Definición

my_dict = dict()
my_other_dict = {}

print(type(my_dict))
print(type(my_other_dict))

my_other_dict = {"Nombre": "Brais",
                 "Apellido": "Moure", "Edad": 35, 1: "Python"}

my_dict = {
    "Nombre": "Brais",
    "Apellido": "Moure",
    "Edad": 35,
    "Lenguajes": {"Python", "Swift", "Kotlin"},
    1: 1.77
}

print(my_other_dict)
print(my_dict)

print(len(my_other_dict))
print(len(my_dict))

# Búsqueda

print(my_dict[1])
print(my_dict["Nombre"])

print("Moure" in my_dict)
print("Apellido" in my_dict)

# Inserción

my_dict["Calle"] = "Calle MoureDev"
print(my_dict)

# Actualización

my_dict["Nombre"] = "Pedro"
print(my_dict["Nombre"])

# Eliminación

del my_dict["Calle"]
print(my_dict)

# Otras operaciones

print(my_dict.items())
print(my_dict.keys())
print(my_dict.values())

my_list = ["Nombre", 1, "Piso"]

my_new_dict = dict.fromkeys((my_list))
print(my_new_dict)
my_new_dict = dict.fromkeys(("Nombre", 1, "Piso"))
print((my_new_dict))
my_new_dict = dict.fromkeys(my_dict)
print((my_new_dict))
my_new_dict = dict.fromkeys(my_dict, "MoureDev")
print((my_new_dict))

my_values = my_new_dict.values()
print(type(my_values))

print(my_new_dict.values())
print(list(dict.fromkeys(list(my_new_dict.values())).keys()))
print(tuple(my_new_dict))
print(set(my_new_dict))

 我们来运行代码

C:\Users\lenovo\AppData\Local\Programs\Python\Python39\python.exe D:\workspace\Hello-Python\Basic\07_dicts.py 
<class 'dict'>
<class 'dict'>
{'Nombre': 'Brais', 'Apellido': 'Moure', 'Edad': 35, 1: 'Python'}
{'Nombre': 'Brais', 'Apellido': 'Moure', 'Edad': 35, 'Lenguajes': {'Python', 'Swift', 'Kotlin'}, 1: 1.77}
4
5
1.77
Brais
False
True
{'Nombre': 'Brais', 'Apellido': 'Moure', 'Edad': 35, 'Lenguajes': {'Python', 'Swift', 'Kotlin'}, 1: 1.77, 'Calle': 'Calle MoureDev'}
Pedro
{'Nombre': 'Pedro', 'Apellido': 'Moure', 'Edad': 35, 'Lenguajes': {'Python', 'Swift', 'Kotlin'}, 1: 1.77}
dict_items([('Nombre', 'Pedro'), ('Apellido', 'Moure'), ('Edad', 35), ('Lenguajes', {'Python', 'Swift', 'Kotlin'}), (1, 1.77)])
dict_keys(['Nombre', 'Apellido', 'Edad', 'Lenguajes', 1])
dict_values(['Pedro', 'Moure', 35, {'Python', 'Swift', 'Kotlin'}, 1.77])
{'Nombre': None, 1: None, 'Piso': None}
{'Nombre': None, 1: None, 'Piso': None}
{'Nombre': None, 'Apellido': None, 'Edad': None, 'Lenguajes': None, 1: None}
{'Nombre': 'MoureDev', 'Apellido': 'MoureDev', 'Edad': 'MoureDev', 'Lenguajes': 'MoureDev', 1: 'MoureDev'}
<class 'dict_values'>
dict_values(['MoureDev', 'MoureDev', 'MoureDev', 'MoureDev', 'MoureDev'])
['MoureDev']
('Nombre', 'Apellido', 'Edad', 'Lenguajes', 1)
{'Nombre', 1, 'Lenguajes', 'Edad', 'Apellido'}

Process finished with exit code 0
 

通过运行结果来分析代码

#声明字典

my_dict = dict()
my_other_dict = {}

#打印字典的类型
print(type(my_dict))
print(type(my_other_dict))

#字典赋值，就是类似JSON结构

my_other_dict = {"Nombre": "Brais",
                 "Apellido": "Moure", "Edad": 35, 1: "Python"}

#稍微复杂一点的字典赋值

my_dict = {
    "Nombre": "Brais",
    "Apellido": "Moure",
    "Edad": 35,
    "Lenguajes": {"Python", "Swift", "Kotlin"},
    1: 1.77
}

 #打印字典和字典长度

print(my_other_dict)
print(my_dict)

print(len(my_other_dict))
print(len(my_dict))

#获取字典键对应的值

print(my_dict[1])
print(my_dict["Nombre"])

#判断值是否在字典中

print("Moure" in my_dict)
print("Apellido" in my_dict)

#往字典中添加键值对

my_dict["Nombre"] = "Pedro"
print(my_dict["Nombre"])

#  删除字典中的键值对

del my_dict["Calle"]
print(my_dict)

#字典的遍历操作

print(my_dict.items())
print(my_dict.keys())
print(my_dict.values())