Question

我有一个非常简单的.csv格式的数据文件，有一个标题和12列数据。

然而，当我打印出第二列时，数据打印出来确定但我也得到 IndexError：列表索引超出范围。

为什么会这样？

这是我的代码：

with open(filename, 'r',newline='') as f:
    reader = csv.reader(f)    
    #read file row by row
    for row in reader:
        print(row[1])

Output:
Point
1
2
3
4
5
6
7
8
9
10

Traceback (most recent call last):

File "C:/Users/workspace/Python 3.5/Examples/readFile.py", line 31, in <module>
   print(row[1])

IndexError: list index out of range

Answer 1

您可以使用try/except块处理错误：

with open(filename, 'r',newline='') as f:
    reader = csv.reader(f)    
    #read file row by row
    for row in reader:
        try:
            print(row[1])
        except IndexError, e:
            # Do something here to alert you to the error
            print(str(e))
            print("This row has no 1st index, but here is the row...")
            print(row)

...或首先检查索引：

with open(filename, 'r',newline='') as f:
    reader = csv.reader(f)    
    #read file row by row
    for row in reader:
        if len(row) > 1:
            print(row[1])

数据打印出来但仍然得到IndexError：列表索引超出范围

1 个答案: