Python访问循环的右值。

Question

我有：

data = [ {"Bucket": "test", "MountPoint": "/data"}, {"Bucket": "test2", "MountPoint": "/data2"} ]

我使用这个循环访问列表中的值Bucket和MountPoint。

my_vals = [val for d in data for val in d.values()]

>>> print(my_vals)
['/data', 'test', '/data2', 'test2']

但是有了这个，我把Bucket和MountPoint放在了我的列表中。现在，通过修改for，我如何才能只将MountPoint放在列表中呢？

谢谢！

Answer 1

一种可能的方法是:列表理解(迭代分词)：

data = [ {"Bucket": "test", "MountPoint": "/data"}, {"Bucket": "test2", "MountPoint": "/data2"} ]

buckets = [d["Bucket"] for d in data]      # ['test', 'test2']
mpoints = [d["MountPoint"] for d in data]  # ['/data', '/data2']

Answer 2

https://ideone.com/XR1qOk

data = [ {"Bucket": "test", "MountPoint": "/data"}, {"Bucket": "test2", "MountPoint": "/data2"} ]

my_vals = [d["MountPoint"] for d in data] 

print(my_vals)