【Selenium】【BugList7】执行driver.find_element_by_id("kw").send_keys("Selenium")，报错：selenium.common.exceptions.InvalidArgumentException: Message: Expected [object Undefined] undefined to be a string

【版本】

selenium：3.11.0

firefox：59.0.3 (64 位)

python：3.6.5

【代码】

#coding=utf-8
from selenium import webdriver

driver = webdriver.Firefox()
driver.get("http://www.baidu.com")

driver.find_element_by_id("kw").send_keys("Selenium")
driver.find_element_by_id("su").click()
driver.quit()

【报错】

==================== RESTART: E:/python_work/1 firefox.py ====================
Traceback (most recent call last):
File "E:/python_work/1 firefox.py", line 7, in <module>
driver.find_element_by_id("kw").send_keys("Selenium")
File "D:Program FilesPython36libsite-packagesseleniumwebdriver emotewebelement.py", line 479, in send_keys
'value': keys_to_typing(value)})
File "D:Program FilesPython36libsite-packagesseleniumwebdriver emotewebelement.py", line 628, in _execute
return self._parent.execute(command, params)
File "D:Program FilesPython36libsite-packagesseleniumwebdriver emotewebdriver.py", line 312, in execute
self.error_handler.check_response(response)
File "D:Program FilesPython36libsite-packagesseleniumwebdriver emoteerrorhandler.py", line 242, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.InvalidArgumentException: Message: Expected [object Undefined] undefined to be a string

【解决方法】

升级geckodriver到v0.21.0已解决：https://github.com/mozilla/geckodriver/releases

【Ending】

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