# 创建一个字典,包含一些初始数据my_dict={"name":"Alice","age":25,"city":"New York"}# 确定要查找的键key_to_find="name"# 使用get方法查找值,避免KeyError异常value=my_dict.get(key_to_find,"Key not found")# 打印找到的值print(f"The value for '{key_to_find}' is '{value}'.") 1....
my_dict = {} # 创建一个空字典 # 添加键值对 my_dict['name'] = 'John' my_dict['age'] = 30 my_dict['city'] = 'New York' # 输出字典中的值 print("Name:", my_dict['name']) print("Age:", my_dict['age']) print("City:", my_dict['city']) 修改字典中的值 你可以通过键...
"copyright", "credits" or "license" for more information. >>> numbers = dict(one=1, two=2, three=3) >>> for key in reversed(numbers): ... print(key) ... Traceback (most recent call last): File "", line 1, inTypeError: 'dict' object is not reversible ...
dict in Python) are a way of storing elements just like you would in a Python list. But, rather than accessing elements using its index, you assign a fixed key to it and access the element using the key. What you now deal with is a "key-value" pair, which is sometimes a more ...
2.带两个星号(*)参数的函数传入的参数则存储为一个字典(dict),并且再调用是采取a=1,b=2,c=3的形式 3.传入的参数个数不定,所以当与普通参数一同使用时,必须把带星号的参数放在最后。 4.函数定义的时候,再函数的参数前面加星号,将传递进来的多个参数转化为一个对象,一个星号转换成元组,两个星号转换成字典...
dic = dict(one=1,two=2,three=3) # 3:通过dict函数和关键字参数 dict(name='喵哥',age=19) # 4:通过列表转字典 l = [('spam',1) , ('egg',2) , ('bar',3)] dic = dict(l) # 5:通过zip创建 拉链函数 re = zip([1,2,3,4],[11,22,33,44]) ...
23.../usr/bin/env python # coding=utf-8 demoDict = {'1':'Chrome', '2':'Android'} for key in demoDict.keys...dict.iterkeys()=', demoDict.iterkeys() interitems和iterms区别参考 http://stackoverflow.com/questions/10458437/python-what-is-the-difference-between-dict-items-and-dict-iter...
字典(dict):字典的值可以是另一个字典,实现嵌套结构: python {'person': {'name': 'John', 'age': 30}} 5. 自定义对象 类的实例:你可以将自定义类的实例作为字典的值: python class Person: def __init__(self, name, age): self.name = name ...
.format(**dict) print(str1) 执行以上代码,输出结果为: Beijing is a beautiful city! 5.4 格式化输出(print(f"string={}")) 在Python 中,print(f"string={}") 是一种用于格式化字符串的语法结构。其中,“string”表示字符串;“f”前缀表示这是一个格式化字符串;“{}”是占位符,用于指示将要插入该位置...
class dict(iterable, **kwarg) 参数说明: **kwargs -- 关键字 mapping -- 元素的容器。 iterable -- 可迭代对象 1 >>>dict()#创建空字典2{}3 >>> dict(a='a', b='b', t='t')#传入关键字4 {'a':'a','b':'b','t':'t'}5 >>> dict(zip(['one','two','three'], [1, 2,...