什么是“列出超出范围的索引”

问：

对于此代码：

file = r<path>
import fitz
sentence = ""
count_block = 0
count_line = 0
count_element = 0
count_element_1 = 0
word_info = []
data = []
p_num = []
# lists of word information
wList = []
bList = []
lList = []
wnList = []
sList = []
# Word Coordinates
word = 4
block = 5
line = 6
word_number = 7
#
doc = fitz.open(file)
pages = len(doc)
count_1 = 0

for page in range(pages):
    print(f'page:{page}')
    for element in list(doc[page].get_text("words")):
        print(element)
        if element[4] == 'Features' or element[4].lower == 'product':
            for element_1 in list(doc[page].get_text("words")):
                if count_element_1 - 1 >= count_element:
                    wList.append(element_1[word])
                    bList.append(element_1[block])
                    lList.append(element_1[line])
                count_element_1 += 1
        count_element += 1
        count_element_1 = 0
    count_element = 0
    for a, b, c in zip(wList, bList, lList):
        word_info.append([a, b, c])
    print(word_info)

当我尝试时，我得到：print(word_info)

[['Model', 4, 0], ['No.', 4, 0], ['KX', 4, 1], ['1504.000', 4, 1], ['Product', 5, 0], ['description', 5, 0], ['The', 5, 1], ['small', 5, 1]]

但是当我尝试时，我得到：print(word_info[0][0])

error list index out of range

注意： 这是元素的样子>>（88.046875， 562.0， 222.33563232421875， 599.5， '1504.000'， 0， 0， 1）