Python出现IndexError: list index out of range错误，求排查帮助

Hey there! Let's break down why you're hitting that IndexError: list index out of range error and fix it up.

The Root Cause #

Take a look at your first for loop:

for x in range(0,9):
    print("Enter user: ",x)
    y = []
    y.append(input())

Every single time this loop runs, you're creating a brand new empty list with y = []. That means after each iteration, the previous version of y gets tossed out, and by the end of the loop, y only holds the very last input you typed (so its length is just 1).

Then your second loop tries to access y[0] through y[8]:

for z in range(0,9):
    print(y[z])

Since y only has 1 element, trying to access indexes 1 and beyond immediately triggers the index out of range error.

The Simple Fix #

Move the y = [] line outside the first loop. This way, you're adding all your inputs to the same list instead of creating a new one each time:

y = []  # Initialize the list once before the loop starts
for x in range(0,9):
    print("Enter user: ",x)
    y.append(input())
for z in range(0,9):
    print(y[z])

Now, every input gets appended to the same y list. After the first loop finishes, y will have 9 elements, and your second loop can safely access each index from 0 to 8 without any issues.

内容的提问来源于stack exchange，提问作者Nahu