python - 如何查找包含特定元素的嵌套列表最后一次出现的索引？

Question

我需要(最终)在嵌套列表中的特定位置插入一个值，但需要将其插入到嵌套列表中最后一次出现特定字符串之后...所以我需要首先找到索引最后一次发生的情况。举个例子可能更有意义(我会概括):

a = 'RPGAccount'

input = [['RPGAccount', 'ddi=0', 'pp=0', 'kol=0', 'sddf=1234567890', '4233f2dsfa=abc', 'igg=dev1', 'id=4g43g34b433435n35n'], ['RPGAccount', 'ddi=0', 'pp=0', 'kol=0', 'sddf=NA', '4233f2dsfa=abc', 'igg=source', 'id=4g43g34b433435n35n'], ['RPGAdditional', 'addkey=asdf', 'addvalue=false', '4233f2dsfa=abc', 'igg=dev1', 'id=4g43g34b433435n35n', 'tz=asdf'], ['RPGAdditional', 'addkey=device_id', 'addvalue=F309387C-AAF5-478D-95A2-28E9B46105C7', '4233f2dsfa=abc', 'igg=dev1', 'id=4g43g34b433435n35n', 'tz=asdf'], ['RPGAdditional', 'addkey=sdaf', 'addvalue=fixed_ap', '4233f2dsfa=abc', 'igg=dev1', 'id=4g43g34b433435n35n', 'tz=asdf’]]

b = 1

所以我需要返回索引 1，因为 1 是列表的索引

['RPGAccount', 'ddi=0', 'pp=0', 'kol=0', 'sddf=NA', '4233f2dsfa=abc', 'igg=source', 'id=4g43g34b433435n35n']

其中包含最后一次出现的字符串“RPGAccount”

我知道我应该做这样的事情:

for l in input:
    for l_ in l:
        if a in l_:
            print input.index[l]
        else:
            pass

解决方案:

some_list = []
for l in input:
    for l_ in l:
        if a in l_:
            some_list.append(input.index(l))
        else:
            pass
location_ = some_list[-1]
print location_

Answer 1

你可以这样做:

a = 'RPGAccount'
input = [['RPGAccount', 'ddi=0', 'pp=0', 'kol=0', 'sddf=1234567890', '4233f2dsfa=abc', 'igg=dev1', 'id=4g43g34b433435n35n'],
         ['RPGAccount', 'ddi=0', 'pp=0', 'kol=0', 'sddf=NA', '4233f2dsfa=abc', 'igg=source', 'id=4g43g34b433435n35n'],
         ['RPGAdditional', 'addkey=asdf', 'addvalue=false', '4233f2dsfa=abc', 'igg=dev1', 'id=4g43g34b433435n35n', 'tz=asdf'],
         ['RPGAdditional', 'addkey=device_id', 'addvalue=F309387C-AAF5-478D-95A2-28E9B46105C7', '4233f2dsfa=abc', 'igg=dev1', 'id=4g43g34b433435n35n', 'tz=asdf'],
         ['RPGAdditional', 'addkey=sdaf', 'addvalue=fixed_ap', '4233f2dsfa=abc', 'igg=dev1', 'id=4g43g34b433435n35n', 'tz=asdf']]
# Index of last sublist containing a - if not found returns -1
b = next((len(input) - i - 1 for i, lst in enumerate(reversed(input)) if a in lst), -1)
print(b)
# 1

使用您的循环，执行以下操作会更有效:

location_ = -1
for i, l in enumerate(input):
    for l_ in l:
        if a in l_:
            location_ = i
print location_
# 1