我们还可以定义一个函数来获取指定索引的数据。 defget_item_by_index(d,index):keys=list(d.keys())ifindex<len(keys):key=keys[index]returnkey,d[key]else:returnNone,None# 测试自定义函数key,value=get_item_by_index(my_dict,2)print(f"索引 2 的键:{key}, 值:{value}") 1. 2. 3. 4. ...
The value of the keykey 一种常见的模式是使用对象的某些索引作为键来对复杂的对象进行排序。例如: >>> student_tuples = [ ('john', 'A', 15), ('jane', 'B', 12), ('dave', 'B', 10), ] >>> sorted(student_tuples, key=lambda student: student[2]) # sort by age [('dave', '...
print(value) # 同时遍历键和值 print("Key-Value Pairs:") for key, valuein my_dict.items(): print(key, value) # 使用enumerate遍历键、值和字典本身 print("With enumerate:") for index, (key, value)inenumerate(my_dict.items()): print(f"Index:{index}, Key:{key}, Value:{value}") ...
>>> d.get('bmi','啥也没有') '啥也没有' 方法三:用内置函数dict(),内部传入参数格式有几种 1、入参为类似 name='python',age=21 的键值对(注意格式:此处key没有'',且type必须为str,value无任何影响) >>> d=dict(name='python',age=21,gender='male') >>> d {'age': 21, 'gender': '...
defget_key_by_value(dictionary,target_value):forkey,valueindictionary.items():ifvalue==target_...
可是有时我们需要对 dictionary 中的 item 进行排序输出,可能根据 key,也可能根据 value 来排。到底有多少种方法可以实现对 dictionary 的内容进行排序输出呢?下面摘取了使用sorted函数实现对 dictionary 的内容进行排序输出一些精彩的解决办法。 1.1 按 key 值对字典排序...
字典是可以存储多个key:value 键值对数据的组合数据类型。也叫映射。 首先声明一个字典 代码语言:javascript 复制 #声明一个空字典 dict={}d1=dict() 对字典的基本数据操作 代码语言:javascript 复制 dict.get()#根据key值获取对应的值 dict.pop()#根据key值删除一个键值对 ...
# get() function with a default value print(planet_size.get("Arrakis","Huh?")) Result None Huh? Access a List Item within a Dictionary You can access a list item within a dictionary by referring to the list's key within the dictionary, followed by the list item's index within the ...
Here, the expression k in address_book searches for a key in the dictionary, not an index or a value. Note that dictionaries don't preserve the order of the pairs, so don't rely on item order when looping over dictionaries. How to Get Values in a Dictionary Now that we've seen how...
Dictionary items are presented in key:value pairs, and can be referred to by using the key name. Example Print the "brand" value of the dictionary: thisdict ={ "brand":"Ford", "model":"Mustang", "year":1964 } print(thisdict["brand"]) ...