Python 在列表中添加数字，但保留其他元素

我有以下清单：

[["hari","cs",10,20],["krish","it",10],["yash","nothing"]]

我需要检查子列表中的数字并添加它们，即，我需要以下输出：

[["hari","cs",30],["krish","it",10],["yash","nothing",0]]

---

我不知道如何处理这个问题。

您可以迭代每个子列表并对数字求和（基于

isinstance

检查），并保持非数字不变：

l = [["hari","cs",10,20],["krish","it",10],["yash","nothing"]]
newl = []
for subl in l:
    newsubl = []
    acc = 0
    for item in subl:
        if isinstance(item, (int, float)):
            acc += item
        else:
            newsubl.append(item)
    newsubl.append(acc)
    newl.append(newsubl)
print(newl)
# [['hari', 'cs', 30], ['krish', 'it', 10], ['yash', 'nothing', 0]]

如果您喜欢生成器函数，可以将其分为两个函数：

l = [["hari","cs",10,20],["krish","it",10],["yash","nothing"]]

def sum_numbers(it):
    acc = 0
    for item in it:
        if isinstance(item, (int, float)):
            acc += item
        else:
            yield item
    yield acc

def process(it):
    for subl in it:
        yield list(sum_numbers(subl))

print(list(process(l)))
# [['hari', 'cs', 30], ['krish', 'it', 10], ['yash', 'nothing', 0]]

试试这个：

l = [["hari","cs",10,20],["krish","it",10],["yash","nothing"]]
sums = [sum([x for x in _l if type(x) == int]) for _l in l]
without_ints = map(lambda _l: filter(lambda x: type(x) == int, _l, l))
out = [w_i + [s] for (s, w_i) in zip(sums, without_ints)]
>>> out
[['hari', 'cs', 30], ['krish', 'it', 10], ['yash', 'nothing', 0]]

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希望有帮助

这是我写过的最大的一行

假设所有数字都在每个列表的末尾，这应该可以做到

my_list = [["hari","cs",10,20],["krish","it",10],["yash","nothing"]]

new_list = [[element if type(element) != int else sum(inner_list[inner_list.index(element):]) for element in inner_list if type(inner_list[inner_list.index(element) - 1 if type(element) == int else 0]) != int] for inner_list in my_list]

print(new_list)  # [['hari', 'cs', 30], ['krish', 'it', 10], ['yash', 'nothing']]

---

数字总是在每个列表的末尾吗？是的@StamKaly，关于模式你是对的。

l = [["hari","cs",10,20],["krish","it",10],["yash","nothing"]]
sums = [sum([x for x in _l if type(x) == int]) for _l in l]
without_ints = map(lambda _l: filter(lambda x: type(x) == int, _l, l))
out = [w_i + [s] for (s, w_i) in zip(sums, without_ints)]
>>> out
[['hari', 'cs', 30], ['krish', 'it', 10], ['yash', 'nothing', 0]]

my_list = [["hari","cs",10,20],["krish","it",10],["yash","nothing"]]

new_list = [[element if type(element) != int else sum(inner_list[inner_list.index(element):]) for element in inner_list if type(inner_list[inner_list.index(element) - 1 if type(element) == int else 0]) != int] for inner_list in my_list]

print(new_list)  # [['hari', 'cs', 30], ['krish', 'it', 10], ['yash', 'nothing']]