I have a Python script that imports a large CSV file and then counts the number of occurrences of each word in the file, then exports the counts to another CSV file.

But what is happening is that once that counting part is finished and the exporting begins it says `Killed` in the terminal.

I don't think this is a memory problem (if it was I assume I would be getting a memory error and not `Killed`).

Could it be that the process is taking too long? If so, is there a way to extend the time-out period so I can avoid this?

Here is the code:

```
csv.field_size_limit(sys.maxsize)
    counter={}
    with open("/home/alex/Documents/version2/cooccur_list.csv",'rb') as file_name:
        reader=csv.reader(file_name)
        for row in reader:
            if len(row)>1:
                pair=row[0]+' '+row[1]
                if pair in counter:
                    counter[pair]+=1
                else:
                    counter[pair]=1
    print 'finished counting'
    writer = csv.writer(open('/home/alex/Documents/version2/dict.csv', 'wb'))
    for key, value in counter.items():
        writer.writerow([key, value])

```

And the `Killed` happens after `finished counting` has printed, and the full message is: 

```
killed (program exited with code: 137)

```