回答

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.ui import Select
import os
import re
driver = webdriver.Chrome('C:/Users/admin/AppData/Local/Google/Chrome/Application/chromedriver.exe')
# 列出目录下所有的图片，存在 images 这个列表中
images = os.listdir('C:/Users/admin/Pictures/Saved Pictures')
# 处理所有图片
for i in range(len(images)):
    # 构建图片路径
    path = 'C:/Users/admin/Pictures/Saved Pictures/' + images[i]
    # 尝试处理所有图片
    try:
        # 打开 Squoosh
        driver.get('https://squoosh.app')
        # 找到输入框
        input_box = driver.find_element_by_xpath('.//input[@class="_2zg9i"]')
        # 输入图片路径
        input_box.send_keys(path)
        #设置图片格式
        select1 = Select(driver.find_elements_by_css_selector('select')[-1])
        if re.match('.*.png',images[i]):
            select1.select_by_value("png")
        if re.match('.*.jpg',images[i]):
            select1.select_by_value("mozjpeg")

        # 等待出现 'smaller'字样，10秒不出现则视为处理失败
        locator = (By.XPATH, './/span[@class="_1eNmr _1U8bE"][last()]')
        WebDriverWait(driver, 25).until(EC.text_to_be_present_in_element(locator, 'smaller'))

        # 找到下载按钮
        button = driver.find_elements_by_xpath('.//a[@title="Download"]')[-1]
        # 点击下载按钮
        button.click()
    # 输出处理失败的图片路径
    except:
        print('*'*30)
        print('Error: '+ path +' failed!')
        print('*'*30)
        continue