I am trying to create a CSV file with a list of URLs.

I am pretty new to programming, so please excuse any sloppy code.

I have a loop that runs through a list of places to get the list of URLs.

I then have a loop within that loop that exports the data to a CSV file.

```
import urllib, csv, re
from BeautifulSoup import BeautifulSoup
list_of_URLs = csv.reader(open("file_location_for_URLs_to_parse"))
for row in list_of_URLs:
    row_string = "".join(row)
    file = urllib.urlopen(row_string)
    page_HTML = file.read()
    soup = BeautifulSoup(page_HTML) # parsing HTML
    Thumbnail_image = soup.findAll("div", {"class": "remositorythumbnail"})
    Thumbnail_image_string = str(Thumbnail_image)
    soup_3 = BeautifulSoup(Thumbnail_image_string)
    Thumbnail_image_URL = soup_3.findAll('a', attrs={'href': re.compile("^http://")})

```

**This is the part that isn't working for me:**

```
    out  = csv.writer(open("file_location", "wb"), delimiter=";")
    for tag in soup_3.findAll('a', href=True):   
        out.writerow(tag['href'])

```

Basically the writer keeps on writing over itself, **is there a way to jump to below the first empty row on the CSV and start writing?**