如何解决错误：“*后的值必须是可迭代的，而不是int”，如下图所示

Question

如何解决错误：“* 后的值必须是可迭代的，而不是 int”，如下图所示 在此处输入图像描述

Answer 1

如果想给出多个参数，Join 需要一个参数，您可以将其作为列表或元组提供。

Answer 2

You're trying to unpack an... integer :)

The asterisk operator in python is used to unpack a list, for example if you have some case like:

full_name = ["Jimi", "Hendrix"]
print("My name is", *full_name)

So in your case you passed an integer, while the operator expects an iterable such as list for example.

Answer 3

I think I get what you're trying to accomplish l. You are trying to put ? for each field in valeur_1[0] (I know some french 🙂).

In that case you should use this

markers = ",".join([ "?" for _ in len(valeur_1[0]) ])