python - 将字典的每个值加倍

Question

我想将字典的每个值加倍（仅将值加倍，不要更改键）。我尝试使用 update()` 方法，通常将其值乘以 2。

# Sol 1: 
dict1 = {"dhoni":50,"jadeja":45,"kohli":60}
dict1["dhoni"]= 100
dict1["jadeja"]= 90
dict1["kohli"]= 120
print(dict1)

# sol 2: 
dict2= {"dhoni":50,"jadeja":45,"kohli":60}
dict2["dhoni"]= 50*2
dict2["jadeja"]= 45*2
dict2["kohli"]= 60*2
print(dict2)

# sol 3: 

dict3 = {"dhoni":50,"jadeja":45,"kohli":60}
x=dict3.values()
dict3["dhoni"]=100
dict3["jadeja"]=90
dict3["kohli"]=120
print(dict3)

标签： pythonlistgoogle-bigquery

Answer 1

这将满足您的需求。

dict1 = {"dhoni":50,"jadeja":45,"kohli":60}
new_dict = dict({k: 2*v for k,v in dict1.items()})

Output:

new_dict = {'dhoni': 100, 'jadeja': 90, 'kohli': 120}

如果要dict1就地更新，则：

for k,v in dict1.items():
    dict1[k] = 2*v

Output:

dict1 = {'dhoni': 100, 'jadeja': 90, 'kohli': 120}