删除嵌套列表python中特定项目之后的所有项目答案

【问题标题】：Remove all items after a specific item in a nested list python删除嵌套列表python中特定项目之后的所有项目
【发布时间】：2020-05-04 19:31:38
【问题描述】：

我有以下嵌套列表，我想删除 我的个人资料 之后的所有项目（包括 我的个人资料）。

my_lst = [['John C, CEO & Co-Funder, ABC company','Eric P, CFO, QWE company','My Profile','Herber W, CTO, PPP company'],
['Eli S, AVP, ACV Company', 'My Profile','Brian M, Analyst, LPL company'],
['Diana F, Managing Director, MS company','Alan X, Associate, JPM company','My Profile', 'Jame R, Manager, AL company']]

我尝试了编码[[i for i in nested if i != 'My Profile'] for nested in my_lst]，但只能从每个列表中删除我的个人资料。

我的预期输出：

[['John C, CEO & Co-Funder, ABC company','Eric P, CFO, QWE company'],
['Eli S, AVP, ACV Company'],
['Diana F, Managing Director, MS company','Alan X, Associate, JPM company']]

提前感谢您的帮助！

【问题讨论】：

标签： python-3.x list nested list-comprehension

【解决方案1】：

使用列表推导，您可以：

my_lst = [['John C, CEO & Co-Funder, ABC company','Eric P, CFO, QWE company','My Profile','Herber W, CTO, PPP company'],
['Eli S, AVP, ACV Company', 'My Profile','Brian M, Analyst, LPL company'],
['Diana F, Managing Director, MS company','Alan X, Associate, JPM company','My Profile', 'Jame R, Manager, AL company']]
results = [nested[:nested.index('My Profile')] if 'My Profile' in nested else nested for nested in my_lst]

没有列表理解：

my_lst = [['John C, CEO & Co-Funder, ABC company','Eric P, CFO, QWE company','My Profile','Herber W, CTO, PPP company'],
    ['Eli S, AVP, ACV Company', 'My Profile','Brian M, Analyst, LPL company'],
    ['Diana F, Managing Director, MS company','Alan X, Associate, JPM company','My Profile', 'Jame R, Manager, AL company']]
results = []
for nested in my_lst:
    filtered = nested[:nested.index('My Profile')] if 'My Profile' in nested else nested
    results.append(filtered)

【讨论】：

如果每个子列表中都有'My Profile'，这将起作用。
感谢@Andrej Kesely 指出这一点，我编辑了我的答案。

【解决方案2】：

您可以使用itertools.takewhile 执行此任务：

from itertools import takewhile

my_lst = [['John C, CEO & Co-Funder, ABC company','Eric P, CFO, QWE company','My Profile','Herber W, CTO, PPP company'],
['Eli S, AVP, ACV Company', 'My Profile','Brian M, Analyst, LPL company'],
['Diana F, Managing Director, MS company','Alan X, Associate, JPM company','My Profile', 'Jame R, Manager, AL company']]

out = []
for i in my_lst:
    out.append([*takewhile(lambda k: k!='My Profile', i)])

from pprint import pprint
pprint(out)

打印：

[['John C, CEO & Co-Funder, ABC company', 'Eric P, CFO, QWE company'],
 ['Eli S, AVP, ACV Company'],
 ['Diana F, Managing Director, MS company', 'Alan X, Associate, JPM company']]

编辑（列表理解版本）：

out = [[*takewhile(lambda k: k!='My Profile', i)] for i in my_lst]

【讨论】：