如何解决 ValueError: is not in list

Question

当它实际上在列表中时，我在这里遇到了同样的问题。 可能还有另一个错误是我的代码检查它，请：

base = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"]
c= base.index(a)

a 是输入，我确定它是“o”、“k”

ValueError: ['o', 'k'] is not in list

另外，我不能try:因为必须完成这一行或整个程序不起作用

Answer 1

您可以像这样尝试输入给定输入中的每个字母，输入：

ip = ["o", "k"]
c = (base.index(i) for i in ip)

输出：

for i in c:
...     print(i)
...
14
10

Answer 2

Base 似乎不是列表列表。

代替 ：

if ['o','k'] in list:

你应该使用：

if 'o' in list and 'k' in list: