Webdriver怎么默认下载PDF而不是打开

import time
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
import random
import pandas as pd
from selenium.webdriver import Chrome
from selenium.webdriver.common.by import By

df = pd.read_excel("1.xlsx", dtype=str)
#print(df.head())
driver = Chrome()

for idx, row in df.iterrows():
    url = "http://www.sefaz.to.gov.br/dare/servlet/hnetccwkda"
    driver.get(url)
    城市 = row["城市"]
    州 = row['州']
    公司号 = row["公司号"]
    公司名 = row['公司名']
    金额 = row["金额"]
    罚款 = row["罚款"]
    发票号 = row["发票号"]
    print(城市, 州, 公司号, 公司名, 金额, 罚款, 发票号)
    print(type(公司号))


    driver.find_element(By.XPATH, '//*[@id="_CECPFCNPJ"]').send_keys(公司号)
    time.sleep(0.1)
    driver.find_element(By.XPATH, '//*[@id="TABLE2"]/tbody/tr[5]/td/p/input').click()
    time.sleep(0.1)
    #Nome / Razão Social
    driver.find_element(By.XPATH, '//*[@id="_DRERAZSOC"]').clear()
    driver.find_element(By.XPATH, '//*[@id="_DRERAZSOC"]').send_keys(公司名)
    time.sleep(0.1)
    #Município Receita
    driver.find_element(By.XPATH, '//*[@id="TABLE1"]/tbody/tr[5]/td[2]/font/select').click()
    driver.find_element(By.XPATH, '//*[@id="TABLE1"]/tbody/tr[5]/td[2]/font/select').send_keys('PALMAS   -   1721000')
    #Município Origem
    driver.find_element(By.XPATH, '//*[@id="TABLE1"]/tbody/tr[4]/td[2]/select').click()
    driver.find_element(By.XPATH, '//*[@id="TABLE1"]/tbody/tr[4]/td[2]/select').send_keys(州)
    time.sleep(2)
    #Código Receita
    driver.find_element(By.XPATH, '//*[@id="TABLE1"]/tbody/tr[12]/td[2]/font/select').click()
    driver.find_element(By.XPATH, '//*[@id="TABLE1"]/tbody/tr[12]/td[2]/font/select').send_keys('116')
    time.sleep(1)
    #Data Vencimento:
    driver.find_element(By.XPATH, '//*[@id="_DREDTAVEN"]').send_keys('04/11/2022')
    time.sleep(0.1)
    #Valor da Receita:
    driver.find_element(By.XPATH, '//*[@id="_DREVLRPRI"]').click()
    driver.find_element(By.XPATH, '//*[@id="_DREVLRPRI"]').send_keys(金额)
    time.sleep(0.1)
    #Período referência
    driver.find_element(By.XPATH, '//*[@id="_DREREFCHAR"]').clear()
    driver.find_element(By.XPATH, '//*[@id="_DREREFCHAR"]').send_keys('11/2022')
    time.sleep(0.1)
    #Multa:
    driver.find_element(By.XPATH, '//*[@id="_DREVLRMLT"]').clear()
    driver.find_element(By.XPATH, '//*[@id="_DREVLRMLT"]').send_keys(罚款)
    time.sleep(0.1)
    #Município Origem
    driver.find_element(By.XPATH, '//*[@id="TABLE1"]/tbody/tr[4]/td[2]/font/select').click()
    driver.find_element(By.XPATH, '//*[@id="TABLE1"]/tbody/tr[4]/td[2]/font/select').send_keys(城市)
    time.sleep(1)
    #//*[@id="TABLE1"]/tbody/tr[22]/td[5]/input
    driver.find_element(By.XPATH, '//*[@id="TABLE1"]/tbody/tr[22]/td[5]/input').click()
    time.sleep(0.1)
    # // *[ @ id = "_DRENFECHV"]
    driver.find_element(By.XPATH, '//*[@id="_DRENFECHV"]').click()
    driver.find_element(By.XPATH, '//*[@id="_DRENFECHV"]').send_keys('00000000000000000000000000000000000000000000')
    #Observação:
    driver.find_element(By.XPATH, '//*[@id="TABLE3"]/tbody/tr/td[2]/textarea').clear()
    driver.find_element(By.XPATH, '//*[@id="TABLE3"]/tbody/tr/td[2]/textarea').send_keys(发票号)
    time.sleep(0.1)
    #//*[@id="TABLE2"]/tbody/tr[8]/td/p/input[1]
    driver.find_element(By.XPATH, '//*[@id="TABLE2"]/tbody/tr[8]/td/p/input[1]').click()
    time.sleep(0.8)
    alerta = driver.switch_to.alert
    alerta.accept()
    time.sleep(1)

运行正常但是点击提交的时候PDF默认打开不保存我想让他默认保存该怎么办