Question

我正在尝试从列表中的项目中删除特定字符，使用另一个列表作为参考。目前我有：

forbiddenList = ["a", "i"]
tempList = ["this", "is", "a", "test"]
sentenceList = [s.replace(items.forbiddenList, '') for s in tempList]
print(sentenceList)

我希望打印出来：

["ths", "s", "test"]

当然，禁止列表非常小，我可以单独替换每个，但我想知道如何“正确”地执行此操作，因为我有一个“禁止”项目的广泛列表。

Answer 1

您可以使用嵌套列表理解。

>>> [''.join(j for j in i if j not in forbiddenList) for i in tempList]
['ths', 's', '', 'test']

如果元素变空（例如，所有字符都在forbiddenList中），您似乎也想删除它们？如果是这样，你可以将整个事物包装在另一个列表中（以可读性为代价）

>>> [s for s in [''.join(j for j in i if j not in forbiddenList) for i in tempList] if s]
['ths', 's', 'test']

Answer 2

>>> templist = ['this', 'is', 'a', 'test']
>>> forbiddenlist = ['a', 'i']
>>> trans = str.maketrans('', '', ''.join(forbiddenlist))
>>> [w for w in (w.translate(trans) for w in templist) if w]
['ths', 's', 'test']

This is a Python 3 solution using str.translate and str.maketrans. It should be fast.

You can also do this in Python 2, but the interface for str.translate is slightly different:

>>> templist = ['this', 'is', 'a', 'test']
>>> forbiddenlist = ['a', 'i']
>>> [w for w in (w.translate(None, ''.join(forbiddenlist)) 
...         for w in templist) if w]
['ths', 's', 'test']

如何使用另一个列表作为参考从列表中的项目中删除字符

2 个答案: