Python - TypeError: 'int'对象没有属性'__getitem__'

I'm a beginner in python and i'm having trouble with iterating in a list. This is the piece of code I'm having trouble with:

我是python的初学者，我在列表中迭代时遇到了麻烦。这就是我遇到麻烦的代码:

for x in list(xrange(instance.nbw)):
         sddpbw.append(choice(sddpfw))
print sddpbw

for t in reversed(list(xrange(instance.T))): 

    if t>0:
        for u in sddpbw:
            # for n in list(xrange(1,instance.NUMPATHS+1,passo)):
            for n in pairs[t][u-1]:
                if n != u:
                    for p in instance.HP:
                        x[n-1][t-1][p-1]=x[u-1][t-1][p-1]

I have a previous list (sddpfw) and want to chosse some elements from it and create another list (sddpbw). The exit is:

我有一个以前的列表(sddpfw)，想从中选择一些元素并创建另一个列表(sddpbw)。出口:

[4, 2]
Traceback (most recent call last):
   File "PDDE.py", line 179, in <module>
       x[n-1][t-1][p-1]=x[u-1][t-1][p-1]
TypeError: 'int' object has no attribute '__getitem__'

But if I comment the section that creates the variable sddpbw and create it mannually it works fine:

但是，如果我对创建变量sddpbw的部分进行注释并创建它，它就会正常工作:

# for x in list(xrange(instance.nbw)):
    # sddpbw.append(choice(sddpfw))
sddpbw=[4, 2]
print sddpbw

I can´t figure out why this is happening.

我可以´t弄清楚这是为什么。

1 个解决方案

#1

Your reset your x variable on this lines. When loop finished, you get x as some integer number.

在这一行重新设置x变量。当循环结束时，将得到x作为一个整数。

for x in list(xrange(instance.nbw)):
     sddpbw.append(choice(sddpfw))

For example

例如

>>> c = [1,2,3]
>>> c
[1, 2, 3]
>>> for c in xrange(1, 3):
...     print(c)
... 
1
2
>>> c
2

You need change this xto anything else name.

您需要将这个xto更改为其他名称。

for _ in list(xrange(instance.nbw)):
   sddpbw.append(choice(sddpfw))

#1