Python 将字典键从字符串更改为整数

我正在尝试使用以下代码将字典的键从字符串转换为整数：

b = {"1":0,"2":0,"3":0,"4":0,"5":0}

for newkey in b:
        newkey[key] = int(newkey[key])
print b   

但是，这会不断产生以下错误：

Traceback (most recent call last):
  File "C:\Python27\counter2", line 22, in <module>
    newkey[key] = int(newkey[key])
NameError: name 'key' is not defined

谁能告诉我我做错了什么

在此代码中感谢

for newkey in b:
        newkey[key] = int(newkey[key])

键以前从未定义过。也许你的意思是
newkey
？相反，简单地用字典理解重建字典，如下所示

>>> b = {"1": 0, "2": 0, "3": 0, "4": 0, "5": 0}
>>> {int(key):b[key] for key in b}
{1: 0, 2: 0, 3: 0, 4: 0, 5: 0}

>>> {int(key): value for key, value in b.iteritems()}
{1: 0, 2: 0, 3: 0, 4: 0, 5: 0}

或者你可以用，像这样

>>> b = {"1": 0, "2": 0, "3": 0, "4": 0, "5": 0}
>>> {int(key):b[key] for key in b}
{1: 0, 2: 0, 3: 0, 4: 0, 5: 0}

>>> {int(key): value for key, value in b.iteritems()}
{1: 0, 2: 0, 3: 0, 4: 0, 5: 0}

您从未定义过
键

你能行

new_b = {int(old_key): val for old_key, val in b.items()}
# int(old_key) will be the key in the new list

由于您正在循环字典
b
，因此可能需要执行以下操作

for newkey in b:
    b[newkey] = int(b[newkey])
print b 

但这毫无意义，它改变了“值”，而不是“键”

您可能希望这样做：

b = {int(key):value for key, value in b.items()}

您从未定义过
键
，正如错误所说的那样。也许您想要b:newkey=int（key）b[newkey]=b[key]

中的key

？