Python-列表索引超出范围csv文件

Question

I am trying to make a dictionary that counts the number of each entry in the 13th to 17th column of a csv file. This is my code so far:

import unicodecsv

with open('hashtag.csv', 'r') as inp, open('hashtag3.csv', 'w') as out:
    writer = unicodecsv.writer(out, delimiter=';', lineterminator='\n',encoding='ISO-8859-1')
    stuff = unicodecsv.reader(inp, delimiter=';', encoding='ISO-8859-1')
    my_dict={}

    for row in stuff:
        for i in range (13,18):
            if row[i] in my_dict:
                my_dict[row[i]]+=1
            else:
                my_dict[row[i]]=1
    print my_dict

However, it tells me this, when I try to run it.

row[i] in my_dict: IndexError: list index out of range

I tried taking each index on its own to figure out where it went wrong and found out, that it works with row[13], but not with any of the other integers in my range. I thought maybe it's because in the other columns, there are some empty cells, but I can't even do an if-request in those other columns without getting the same error.

Answer 1

It seems like, for some reason, row does not have all 13-18 columns.
Modify the for loop to

for i in range(13,min(len(row),18)):

PS,
Instead of the (somewhat) cumbersome if row[i] in my_dict you might consider using defaultdict :

from collections import defaultdict

my_dict = defaultdict(int)  # accessing a new key returns zero
# ...
for row in stuff:
    for i in xrange(13, min(18, len(row))):
        my_dict[row[i]] += 1