有点复杂的列表理解

Question

我需要过滤一个二维数组

[
  [1, 'eth0', 'description', ...],
  [2, 'virbr0', 'description', ...],
  [3, 'qvb25f982e4-ae', 'description', ...],
  [4, 'tap25f982e4-ae', 'description', ...],
...
]

基本上我想过滤掉某些接口名称。我过滤掉以q开头的接口，如下所示：

info = [i for i in info if not i[1].startswith('q')]

但我需要能够定义一个要忽略的接口前缀列表，例如：

exclude = ['q','tap']
info = [i for i in info if not i[1].startswith(exclude)]

但我好像搞不懂这样的逻辑。你知道吗

Answer 1

你太接近了！。把exclude变成一个元组：

exclude = ('q','tap')
info = [i for i in info if not i[1].startswith(exclude)]

从documentation：

... prefix can also be a tuple¹ of prefixes to look for....

---

演示：

>>> info = [
...   [1, 'eth0', 'description'],
...   [2, 'virbr0', 'description'],
...   [3, 'qvb25f982e4-ae', 'description'],
...   [4, 'tap25f982e4-ae', 'description'],
... ]
>>> 
>>> exclude = ('q','tap')
>>> info = [i for i in info if not i[1].startswith(exclude)]
>>> 
>>> info
[[1, 'eth0', 'description'], [2, 'virbr0', 'description']]

我加了重点…