example queue

import shutil
import time

def createBackup(fn):
    year = str(time.localtime()[0])
    month = str(time.localtime()[1])
    day = str(time.localtime()[2])
    csv_fn = '_'.join(['backup',year,month,day,'verificationRequestsQueue.csv'])
    shutil.copy(fn,csv_fn)
    return

def return_lines(fn):
    with open(fn,'r+') as f:
        lines = f.read()
    lines = lines.split('\n')
    return lines

def write_lines(lines,fn):
    with open(fn,'wb') as f:
        for l in lines:
            f.write(l+'\n')
    return

def upload(lines):
    runSelenium()
    return


fn = 'C:/path/to/queue.csv'
createBackup(fn)
lines = return_lines(fn)
if len(lines) > 20:
    upload_lines = lines[:20]
    updated_queue = lines[21:]
    upload(upload_lines)
    write_lines(updated_queue)
else:
    upload_lines = lines
    upload(upload_lines)