Python Selenium Firefox 脚本在重新启动驱动程序实例后崩溃

Question

我有一个循环运行的 Python Selenium 脚本，它像这样每 100 次迭代退出浏览器......

def init_driver():
    ffprofile = webdriver.FirefoxProfile("my_profile");
    ffprofile.add_extension(extension="myaddon.xpi")
    return driver

driver = init_driver()

for i, item, in enumerate(item_list):
    check_item(item)
    print ( "" )
    if i == 0:
        print ( "Ignoring First Item" )
    elif i % 100 == 0:
            driver.quit()
            driver = init_driver()

在驱动程序重新启动期间，它随机崩溃并出现错误...

Traceback (most recent call last):

  File "C:\scripts\main.py", line 118, in <module>
    driver = init_driver()

    File "C:\scripts\main.py", line 98, in init_driver
    driver = webdriver.Firefox(firefox_profile=ffprofile)

    File "C:\Users\john\AppData\Local\Programs\Python\Python35\lib\site-packages\selenium\webdriver\firefox\webdriver.py", line 78, in __init__
    self.binary, timeout)

    File "C:\Users\john\AppData\Local\Programs\Python\Python35\lib\site-packages\selenium\webdriver\firefox\extension_connection.py", line 49, in __init__
    self.profile.add_extension()

    File "C:\Users\john\AppData\Local\Programs\Python\Python35\lib\site-packages\selenium\webdriver\firefox\firefox_profile.py", line 91, in add_extension
    self._install_extension(extension)

    File "C:\Users\john\AppData\Local\Programs\Python\Python35\lib\site-packages\selenium\webdriver\firefox\firefox_profile.py", line 287, in _install_extension
    shutil.rmtree(tmpdir)

    File "C:\Users\john\AppData\Local\Programs\Python\Python35\lib\shutil.py", line 488, in rmtree
    return _rmtree_unsafe(path, onerror)

    File "C:\Users\john\AppData\Local\Programs\Python\Python35\lib\shutil.py", line 378, in _rmtree_unsafe
    _rmtree_unsafe(fullname, onerror)

    File "C:\Users\john\AppData\Local\Programs\Python\Python35\lib\shutil.py", line 378, in _rmtree_unsafe
    _rmtree_unsafe(fullname, onerror)

    File "C:\Users\john\AppData\Local\Programs\Python\Python35\lib\shutil.py", line 378, in _rmtree_unsafe
    _rmtree_unsafe(fullname, onerror)

    File "C:\Users\john\AppData\Local\Programs\Python\Python35\lib\shutil.py", line 383, in _rmtree_unsafe
    onerror(os.unlink, fullname, sys.exc_info())

    File "C:\Users\john\AppData\Local\Programs\Python\Python35\lib\shutil.py", line 381, in _rmtree_unsafe
    os.unlink(fullname)

    PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\Users\\john\\AppData\\Local\\Temp\\tmpoaizz71l.webdriver.xpi\\platform\\WINNT_x86-msvc\\components\\imehandler.dll'

有时它可以经历数千次迭代而不会崩溃，而其他时候它发生在 100 次之后

有人知道发生了什么事吗？

Answer 1

很可能，由于竞争条件，这发生在临时配置文件删除时 - 共享库仍然访问该目录。 Firefox 和 Selenium 是相当异步的，所以有时垃圾只是发生在流程的各个阶段，您可能会查看诸如“等待加载元素”之类的问题。

我想您有两个实用的选择来处理这个问题:如果这种情况发生/很少发生/，只需在 driver_init 附近的代码中添加一个 try-except-wait-repeat block 。这很丑陋，但有时这是努力结果的唯一合理方式。

或者，您可以切换平台 :) 在像 Linux 这样的系统中，打开的文件通常不会阻止它们的删除。