def METHOD_NAME(url, filename):
    """
    url (string): place from where to download
    filename (sting): place to where to save (if already exists, will be deleted)
    """
    if url.startswith("/"): # absolute path
        url = URL_DB + url
    ufile = urlopen(url)
    lfile = open(filename, 'wb')  # will delete if exists
    shutil.copyfileobj(ufile, lfile)