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这是我想用selenium模块打开火狐浏览器,为什么会报错呢?
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 from selenium import webdriver
 >>> browser = webdriver.Firefox()
 Traceback (most recent call last):
 File "D:\python\Python38\lib\site-packages\selenium\webdriver\common\service.py", line 72, in start
 self.process = subprocess.Popen(cmd, env=self.env,
 File "D:\python\Python38\lib\subprocess.py", line 854, in __init__
 self._execute_child(args, executable, preexec_fn, close_fds,
 File "D:\python\Python38\lib\subprocess.py", line 1307, in _execute_child
 hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
 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 "<pyshell#1>", line 1, in <module>
 browser = webdriver.Firefox()
 File "D:\python\Python38\lib\site-packages\selenium\webdriver\firefox\webdriver.py", line 166, in __init__
 self.service.start()
 File "D:\python\Python38\lib\site-packages\selenium\webdriver\common\service.py", line 81, in start
 raise WebDriverException(
 selenium.common.exceptions.WebDriverException: Message: 'geckodriver' executable needs to be in PATH.
 
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