for i, store in enumerate(pharm['address'].tolist()[:20:]):
    time.sleep(0.2)
    try:
        coord = geocode(store)
    except:
        coord = 'error'
    print(coord, store)
    all_addresses.append(coord)

    i += 1
    if i % 5 == 0:
        print('{0} drugstores processed'.format(i))