values = sales.values() print('Original items:', values) # delete an item from dictionary del[sales['apple']] print('Updated items:', values) Output Original items: dict_values([2, 4, 3]) Updated items: dict_values([4, 3]) The view object values doesn't itself return a list...
字典Dictionary 在Python中,字典(Dictionary)是一种无序的、可变的数据类型,用于存储键-值(key-value)对的集合。字典是通过键来索引和访问值的,而不是通过位置。 字典dictionary ,在一些编程语言中也称为 hash , map ,是一种由键值对组成的数据结构。 基本操作 python用{}或者dict()来创建声明一个空字典 In...
print('stu1102'in info) #标准用法 print(info.get('stu1103')) #获取 print(info['stu1102']) #查找键为’stu1102’的值 print(info) #输出整个字典 print(info.keys()) #输出字典info的所有键 print(info.values()) #输出字典info的所有值 执行结果 True XiaoZe Maliya LongZe Luola {'stu1103': ...
v in dictionary.items() if v == value] keys = get_keys_from_value(my_dict, 2) print(ke...
print(f"{cities[0]}:{phones[0]}")# soochow: 0512 类似这样,一个对象与另外一个对象之间建立对应关系,也是日常生活和生产中常见的事情,比如建立员工的姓名和工资、奖金之间的对应关系,建立学生和各个科目考试成绩之间的对应关系等等。既然如此司空见惯,Python 必然要有内置对象类型,这就是 字典Dictionary。
print(dict1) {'shanghai':'pudong','sichuan':'chengdu'} fromkey:创建一个新的字典,以序列seq中的元素作为字典的键,value为字典所有键对应的初始值; seq='ShangHai','Beijing','SiChuan' dict=dict.fromkeys(seq,100) print(dict) {'Beijing':100,'ShangHai':100,'SiChuan':100} ...
Here we add some values to thefruitsdictionary. print(fruits.setdefault('oranges', 11)) print(fruits.setdefault('kiwis', 11)) The first line prints12to the terminal. The'oranges'key exists in the dictionary. In such a case, the method returns the its value. In the second case, the key...
country_capitals = {"United States":"Washington D.C.","Italy":"Rome"}# print dictionary keys one by oneforcountryincountry_capitals:print(country)print()# print dictionary values one by oneforcountryincountry_capitals: capital = country_capitals[country]print(capital) ...
Getting Keys, Values, or Both From a DictionaryIf you want to conserve all the information from a dictionary when sorting it, the typical first step is to call the .items() method on the dictionary. Calling .items() on the dictionary will provide an iterable of tuples representing the key...
fruit_dict.clear()print(fruit_dict)# 输出:{} 2.5 遍历字典 2.5.1 遍历键 forkeyinfruit_dict:print(key) 2.5.2 遍历值 forvalueinfruit_dict.values():print(value) 2.5.3 遍历键值对 forkey,valueinfruit_dict.items():print(f'{key}:{value}') ...