My problem is that the average value on this won't show up as it returns as an error
我的问题是,它的平均值不会显示,因为它返回错误
Traceback (most recent call last):
(file location), line 29, in <module>
average_score = [[x[8],x[0]] for x in a_list]
(file location), line 29, in <listcomp>
average_score = [[x[8],x[0]] for x in a_list]
IndexError: list index out of range
the code
import csv
class_a = open('class_a.txt')
csv_a = csv.reader(class_a)
a_list = []
for row in csv_a:
row[3] = int(row[3])
row[4] = int(row[4])
row[5] = int(row[5])
minimum = min(row[3:5])
row.append(minimum)
maximum = max(row[3:5])
row.append(maximum)
average = sum(row[3:5])//3
row.append(average)
a_list.append(row[0:8])
print(row[8])
this clearly works when I test out the values 0 to 7 ,even if I change the location of the avarage sum I still get the error
当我测试0到7的值时,这显然有效,即使我改变了平均值的位置我仍然得到错误
1 个解决方案
#1
When you call a_list.append(row[0:8]) you're appending an array using only indexes 0, 1, 2, 3, 4, 5, 6, and 7 from row. This means that when you later iterate a_list, the x variable only has indexes up to 7, and you're trying to access 8.
当你调用a_list.append(row [0:8])时,你只使用索引0,1,2,3,4,5,6和7来追加一个数组。这意味着当您稍后迭代a_list时,x变量只有最多7的索引,并且您尝试访问8。
Quick example:
>>> row = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> x = row[:8]
>>> x[8]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IndexError: list index out of range
>>> x[7]
7
>>>
#1
When you call a_list.append(row[0:8]) you're appending an array using only indexes 0, 1, 2, 3, 4, 5, 6, and 7 from row. This means that when you later iterate a_list, the x variable only has indexes up to 7, and you're trying to access 8.
当你调用a_list.append(row [0:8])时,你只使用索引0,1,2,3,4,5,6和7来追加一个数组。这意味着当您稍后迭代a_list时,x变量只有最多7的索引,并且您尝试访问8。
Quick example:
>>> row = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> x = row[:8]
>>> x[8]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IndexError: list index out of range
>>> x[7]
7
>>>