python FileNotFoundError: [WinError 2] 系统找不到指定的文件。，,Traceback

python FileNotFoundError: [WinError 2] 系统找不到指定的文件。，,Traceback

Traceback (most recent call last):  File "C:\_____Soft______\python3.6\lib\site-packages\selenium\webdriver\common\service.py", line 76, in start    stdin=PIPE)  File "C:\_____Soft______\python3.6\lib\subprocess.py", line 709, in __init__    restore_signals, start_new_session)  File "C:\_____Soft______\python3.6\lib\subprocess.py", line 997, in _execute_child    startupinfo)FileNotFoundError: [WinError 2] 系统找不到指定的文件。During handling of the above exception, another exception occurred:Traceback (most recent call last):  File "alimama.py", line 76, in <module>    sp = Spider()  File "alimama.py", line 11, in __init__    self.web = webdriver.Chrome()  File "C:\_____Soft______\python3.6\lib\site-packages\selenium\webdriver\chrome\webdriver.py", line 68, in __init__    self.service.start()  File "C:\_____Soft______\python3.6\lib\site-packages\selenium\webdriver\common\service.py", line 83, in start    os.path.basename(self.path), self.start_error_message)selenium.common.exceptions.WebDriverException: Message: ‘chromedriver‘ executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

1、首先需要下载浏览器驱动
2、即便是firefox，在version>47时，也是需要安装firefox的浏览器驱动
3、浏览器驱动需要放在python安装目录
4、系统环境变量，path需要加入浏览器驱动地址

修改subprocess.py 文件

    def __init__(self, args, bufsize=-1, executable=None,                 stdin=None, stdout=None, stderr=None,shell=true,  这里添加                 preexec_fn=None, close_fds=_PLATFORM_DEFAULT_CLOSE_FDS,                 shell=False, cwd=None, env=None, universal_newlines=False,                 startupinfo=None, creationflags=0,                 restore_signals=True, start_new_session=False,                 pass_fds=(), *, encoding=None, errors=None):

python FileNotFoundError: [WinError 2] 系统找不到指定的文件。