python:根据字符串名称过滤字符串列表

Question

我有一个字符串列表,如下所示:

li1 = ['pin 2.3','vlo 5.4', 'lu 1.3', '3 packages installed', '', 'bla']

l12 = ['pin 2.3','vlo 5.4', '2 packages installed', 'bla', 'bla']

我想从列表中过滤掉字符串'x packages installed'以及后面的字符串:

out1 = ['pin 2.3','vlo 5.4', 'lu 1.3']


out2 = ['pin 2.3','vlo 5.4']

我怎么能用列表理解呢？谢谢

Answer 1

您可以使用itertools.takewhile,它从列表中获取项目,直到未传递给定条件:

from itertools import takewhile

l12 = ['pin 2.3','vlo 5.4', '2 packages installed', 'bla', 'bla']
li1 = ['pin 2.3','vlo 5.4', 'lu 1.3', '3 packages installed', '', 'bla']



r12 = takewhile(lambda x: "packages installed" not in x, l12)
ri1 = takewhile(lambda x: "packages installed" not in x, li1)
print(list(r12))
# ['pin 2.3', 'vlo 5.4']

print(list(ri1))
# ['pin 2.3', 'vlo 5.4', 'lu 1.3']