Last Updated on 2022-07-24 by Clay
Problem
Today, I checked the code left by my predecessors, I found a strange problem. I think, that is the code that the predecessors discarded that are not in use and just haven’t been deleted.
It looks like Python is using the built-in csv module to read the data, but it occurs the following error:
"_csv.reader" object is not subscriptable
In order to make the code work normally, I inquired about the troubleshooting method of this problem and recorded it as follows.
If I remember correctly, I had this problem once a few years ago. In order not to get stuck with this problem in a few years, I think I need to document the problem honestly.
Solution
According to the error message, the _csv.reader does not actually support the use of index values, it returns an iterator.
So when we use something like:
print(csv_data[0])
… to take the value, the error shown at the beginning of the article will appear. We need to use the for-loop to read the data line by line; if you really need to get the data through the index, you can consider turning the iterator into a list structure.
list(csv_data)