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def import_users(infile, api, delete=False, dry_run=False, batch_size=1000):
    """Import from file infile user data.  The input file is assumed to be in
       csv format."""
    reader = csv.DictReader(infile)

    batch_nr = 1
    batch = []
    for nr, d in enumerate(reader):
        batch.append(d)
        if (nr % batch_size) == 0 and nr>0:
            print "Importing batch %d ... " % batch_nr,
            sys.stdout.flush()
            start = time.time()

            # import the users
            if not dry_run:
                result = api.bulk_import(batch, delete=delete)

            print "done (%d seconds)." % (time.time() - start)
            batch_nr = batch_nr + 1

            # reset batch list
            batch = []