import time
from selenium import webdriver

driver = webdriver.Chrome()
driver.get("某个会有弹窗的网址")

# 关于alert弹框的切换
alert = driver.switch_to.alert
# 点击确认
alert.accept()
# 点击取消
alert.dismiss()
# 输入内容
alert.send_keys("666888")
alert.accept()

time.sleep(10)

driver.quit()