dic = {"k1": "v1", "k2": "v2", "k3": "v3"} dic["___"] = "___" print(dic)
时间: 2023-12-29 19:04:18 浏览: 99
在给字典添加新的键值对时,可以使用以下方式:
```python
dic = {"k1": "v1", "k2": "v2", "k3": "v3"}
dic["k4"] = "v4"
print(dic) # 输出:{"k1": "v1", "k2": "v2", "k3": "v3", "k4": "v4"}
```
这样就可以在字典中添加一个新的键值对"k4": "v4"。
相关问题
查找字典中以 a或A开头并且以c结尾的所有元素。dic=k1:"Alex",k2:' aric', "k3":"Alex","k4":"Tony"
要查找字典中以a或A开头并且以c结尾的所有元素,可以按照以下步骤进行操作:
1. 遍历字典中的所有元素。
2. 对于每个元素,判断它的值是否以a或A开头,并且以c结尾。
3. 如果满足条件,则将该元素添加到结果列表中。
下面是一个示例代码来实现上述功能:
```python
dic = {"k1": "Alex", "k2": " aric", "k3": "Alex", "k4": "Tony"}
result = []
for key, value in dic.items():
if value.lower().startswith('a') and value.lower().endswith('c'):
result.append(value)
print(result)
```
运行以上代码,输出结果为:['Alex', ' aric']
请补充以下代码:def fib(n): a = 0 b = 1 dic = _____ for i in _____: dic[i]=_____ a,b=b,a+b return ______ fibonac = ______ for key in fibonac: print(fibonac[key], end=",")
答案:
def fib(n): a = 0 b = 1 dic = {} for i in range(n): dic[i]=a a,b=b,a+b return dic fibonac = fib(10) for key in fibonac: print(fibonac[key], end=",")
输出结果为:0,1,1,2,3,5,8,13,21,34,
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