本文介绍了如何从字典中打印特定的键值?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
fruit = {香蕉":1.00,苹果":1.53,猕猴桃":2.00,鳄梨":3.23,芒果":2.33,菠萝":1.44,草莓":1.95,甜瓜":2.34,葡萄":0.98}对于fruit.items() 中的键、值:打印(值)
我想打印奇异果钥匙,怎么办?
print(value[2])
这不起作用.
解决方案
为时已晚,但没有提到关于 dict.get() 方法
>>>打印(水果.get('猕猴桃'))2.0在 dict.get()
方法中,您还可以传递默认值,如果字典中不存在键,它将返回默认值.如果未指定默认值,则返回 None
.
fruit
字典没有名为 cherry
的键,所以 dict.get()
方法返回默认值 99
>
fruit = {
"banana": 1.00,
"apple": 1.53,
"kiwi": 2.00,
"avocado": 3.23,
"mango": 2.33,
"pineapple": 1.44,
"strawberries": 1.95,
"melon": 2.34,
"grapes": 0.98
}
for key,value in fruit.items():
print(value)
I want to print the kiwi key, how?
print(value[2])
This is not working.
解决方案
It's too late but none of the answer mentioned about dict.get() method
>>> print(fruit.get('kiwi'))
2.0
In dict.get()
method you can also pass default value if key not exist in the dictionary it will return default value. If default value is not specified then it will return None
.
>>> print(fruit.get('cherry', 99))
99
fruit
dictionary doesn't have key named cherry
so dict.get()
method returns default value 99
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