Python Selenium将HTML发送到标准输出，并将错误发送到标准输出

我有这个脚本，它很有效。。但是我想将HTML发送到stdout，将错误（异常）发送到stderr

import time
from pyvirtualdisplay import Display
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.common.exceptions import TimeoutException

display = Display(visible=0, size=(800, 600))
display.start()

def init_driver():
    driver = webdriver.Firefox()
    driver.wait = WebDriverWait(driver, 5)
    return driver

def lookup(driver, query):
    driver.get("http://www.google.com")

    try:
        box = driver.wait.until(EC.presence_of_element_located(
            (By.NAME, "q")))
        box.send_keys(query)
        button = driver.wait.until(EC.element_to_be_clickable(
            (By.NAME, "btnG")))
        button.click()
    except TimeoutException:
        print "Box or Button not found in google.com"

if __name__ == "__main__":
    driver = init_driver()
    lookup(driver, "Selenium")
    time.sleep(5)
    driver.quit()
    display.stop()

我想

except TimeoutException:
    print>>sys.stderr, "Box or Button not found in google.com"

但是默认情况下，sys.stdout和sys.stderr都会打印到控制台