IndexError: index 8000 is out of bounds for axis 0 with size 8000

用了一个新的数据集，跑的也是之前跑过的代码，可是出现了问题：

# coding=utf-8
import pandas as pd
import numpy as np
import fasttext
from sklearn import metrics

with open('train_abstract.txt','w',encoding='utf-8') as f:
    for i in range(len(X_train.todense())):
        str1 = str(X_train.todense()[i])+"\t"+"__label__"+str(y_train.values[i])+'\n'
        f.write(str1)

with open('test_abstract.txt','w',encoding='utf-8') as f:
    for i in range(len(X_test)):
        str1 = str(X_test.values[i])+"\t"+"__label__"+str(y_test.values[i])+'\n'
        f.write(str1)

IndexError                                Traceback (most recent call last)
<ipython-input-38-1b98cdb96387> in <module>()
      7 with open('train_abstract.txt','w',encoding='utf-8') as f:
      8     for i in range(len(X_train.todense())):
----> 9         str1 = str(X_train.todense()[i])+"\t"+"__label__"+str(y_train.values[i])+'\n'
     10         f.write(str1)
     11 

IndexError: index 8000 is out of bounds for axis 0 with size 8000

麻烦大家帮忙解答一下，谢谢！

IndexError: index 8000 is out of bounds for axis 0 with size 8000
是指列表出现问题，应该是列表为空或者列表长度为8000，索引值为8000时导致越界了。

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博主找到问题了吗，我也是出现这个问题