使用 for x in y 时出现索引超出范围错误 Python

Question

My code is as follows, and using the for x in y structure to iterate through an array.

with open('userIDs.csv', 'r', newline='') as csv_file_IDs:
    csv_reader_IDs = csv.reader(csv_file_IDs, delimiter=',')
    for rowID in csv_reader_IDs:
        data = [rowID[0], rowID[1], rowID[2], rowID[3], rowID[4]]
        userIDs.append(data)

However, I'm getting the following error when trying to run my code.

in <module>
    data = [rowID[0], rowID[1], rowID[2], rowID[3], rowID[4]]
IndexError: list index out of range

I've checked that there are no blank lines in the CSV file.

Answer 1

It's clear that at least one of the lines in your CSV file does not contain the requisite number of values.

It would be simpler to do this:

import csv
with open('userIDs.csv') as csv_file_IDs:
    userIDs = [e[:5] for e in csv.reader(csv_file_IDs)]
    print(userIDs)

You could then examine the list ( userIDs ) for any elements that don't have enough values