Python - “元组索引超出范围”
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Python - "tuple index out of range"
提问by keirbtre
I am writing a program to display information about countries in a table format. It worked perfectly fine when I had 3 countries, but changing it to 10 (and adjusting all necessary code accordingly) resulted in the error, "Tuple index out of range" in the line:
我正在编写一个程序，以表格格式显示有关国家的信息。当我有 3 个国家时，它工作得很好，但是将其更改为 10（并相应地调整所有必要的代码）导致错误，“元组索引超出范围”行中：
print("{0:^20}{1:^20}{2:^20}{3:^20}{4:^20}{5:^20}[6:^20}{7:^20}{8:^20}{9:^20}".format(newcountrylist[i].country,newcountrylist[i].currency,newcountrylist[i].exchange))
采纳答案by Martijn Pieters
You need to pass in a matching number of arguments for your format slots. Your format string has 10 slots, but you are only passing in 3 values.
您需要为格式槽传递匹配数量的参数。您的格式字符串有 10 个插槽，但您只传递了 3 个值。
Reduced to 4 format slots, with only 3 arguments to .format(), shows the same error:
减少到 4 个格式槽，只有 3 个参数给.format()，显示相同的错误：
>>> '{0:^20}{1:^20}{2:^20}{3:^20}'.format(1, 2, 3)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IndexError: tuple index out of range
>>> '{0:^20}{1:^20}{2:^20}{3:^20}'.format(1, 2, 3, 4)
' 1 2 3 4 '
When I passed in 4 arguments the .format()call succeeds.
当我传入 4 个参数时，.format()调用成功。
回答by oneindelijk
As an aswer to jon141: I'm also facing this issue and I'm trying to solve this by looping over one item of a column (I'm passing a 2 dimensional array) and then building the string based on that. So I end up with a string like
作为对 jon141 的回答：我也面临这个问题，我试图通过循环一列的一项（我正在传递一个二维数组）然后基于它构建字符串来解决这个问题。所以我最终得到一个字符串
template="{0!s:10}{1!s:15}...{n!s:24}
The elements I want to format I put in a tuple. but when I do
我想格式化的元素放在一个元组中。但是当我这样做的时候
template.format(tuple_variable)
it throws an error that the tuple index is out of range
它抛出元组索引超出范围的错误
Probably because it's now passing a tuple of a tuple to the function, which has one element, the tuple
可能是因为它现在将元组的元组传递给函数，该函数具有一个元素，即元组
I haven't figured out how to fix that yet, but follow the threadif you need more info on it.
我还没有想出如何解决这个问题，但 如果你需要更多信息，请关注线程。
