downloader.py

import requests
from requests.exceptions import ConnectionError


with open('gi.csv', 'r') as f:
    lineas = f.readlines()

urls = enumerate([linea.split(',')[0] for linea in lineas][1::])

session = requests.Session()

for index, url in urls:
    print(url)
    try:
        r = session.get(url, stream=True)
    except ConnectionError:
        with open('errores.txt', 'a') as f:
            print(f'No se pudo descargar {url}', file=f, end='\n')
            continue

    with open(f'imgs/{index}.jpg', 'xb') as f:
        for chunk in r.iter_content(chunk_size=512*1024):
            f.write(chunk)