Python 链接

Question

假设我有:

dic = {"z":"zv", "a":"av"}
## Why doesn't the following return a sorted list of keys?
keys = dic.keys().sort()

我知道我可以执行以下操作并获得正确的结果:

dic = {"z":"zv", "a":"av"}
keys = dic.keys()
skeys = keys.sort()  ### 'skeys' will be None

为什么第一个示例不起作用？

Answer 1

.sort 不返回列表。你可以这样做:

keys = sorted(dic.keys())