如何循环遍历字典以删除与字符串匹配的值？
如何循环遍历字典以删除与字符串匹配的值？
提问于 2018-12-31 04:12:44
如果字典中包含特定的字符串，我希望从字典中删除值，并相应地删除任何将空列表作为值的键。
mydict = {
'Getting links from: https://www.foo.com/':
[
'+---OK--- http://www.this.com/',
'+---OK--- http://www.is.com/',
'+-BROKEN- http://www.broken.com/',
'+---OK--- http://www.set.com/',
'+---OK--- http://www.one.com/'
],
'Getting links from: https://www.bar.com/':
[
'+---OK--- http://www.this.com/',
'+---OK--- http://www.is.com/',
'+-BROKEN- http://www.broken.com/'
],
'Getting links from: https://www.boo.com/':
[
'+---OK--- http://www.this.com/',
'+---OK--- http://www.is.com/'
]
}
val = "is"
for k, v in mydict.iteritems():
if v.contains(val):
del mydict[v]我想要的结果是：
{
'Getting links from: https://www.foo.com/':
[
'+-BROKEN- http://www.broken.com/',
'+---OK--- http://www.set.com/',
'+---OK--- http://www.one.com/'
],
'Getting links from: https://www.bar.com/':
[
'+-BROKEN- http://www.broken.com/'
]
}如何删除包含字符串的所有字典值，以及结果没有值的任何键？
回答 5
Stack Overflow用户
回答已采纳
发布于 2018-12-31 04:28:16
您可以在字典理解中使用列表理解。您不应该在迭代字典时更改字典中的项数。
res = {k: [x for x in v if 'is' not in x] for k, v in mydict.items()}
# {'Getting links from: https://www.foo.com/': ['+-BROKEN- http://www.broken.com/',
# '+---OK--- http://www.set.com/',
# '+---OK--- http://www.one.com/'],
# 'Getting links from: https://www.bar.com/': ['+-BROKEN- http://www.broken.com/'],
# 'Getting links from: https://www.boo.com/': []}如果希望删除具有空列表值的项，则可以在随后的步骤中：
res = {k: v for k, v in res.items() if v}Stack Overflow用户
发布于 2018-12-31 04:36:24
使用简单循环：
val = "is"
new_dict = dict()
for k, v in mydict.items():
values = [i for i in v if val not in i]
if values: new_dict[k] = values
print(new_dict)产出：
{'Getting links from: https://www.foo.com/': ['+-BROKEN- http://www.broken.com/', '+---OK--- http://www.set.com/', '+---OK--- http://www.one.com/'], 'Getting links from: https://www.bar.com/': ['+-BROKEN- http://www.broken.com/']}Stack Overflow用户
发布于 2018-12-31 04:26:17
这是一个单线
{k: [e for e in v if val not in e] for k, v in mydict.items() if any([val not in e for e in v])}预期产出：
Out[1]: {
'Getting links from: https://www.bar.com/':
[
'+-BROKEN- http://www.broken.com/'
],
'Getting links from: https://www.foo.com/':
[
'+-BROKEN- http://www.broken.com/',
'+---OK--- http://www.set.com/',
'+---OK--- http://www.one.com/'
]
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/53987387
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