python3 selenium 无头浏览器 错误 FileNotFoundError: [Errno 2] No such file or directory: 'geckodriver'

代码：

from selenium import webdriver
browser = webdriver.Firefox()
browser.get('http://localhost:8000')
assert 'Django' in browser.title

 

报错：

Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/common/service.py",line 74,in start
stdout=self.log_file,stderr=self.log_file)
File "/usr/lib/python3.5/subprocess.py",line 947,in __init__
restore_signals,start_new_session)
File "/usr/lib/python3.5/subprocess.py",line 1551,in _execute_child
raise child_exception_type(errno_num,err_msg)
FileNotFoundError: [Errno 2] No such file or directory: 'geckodriver'

During handling of the above exception,another exception occurred:

Traceback (most recent call last):
File "functional_test.py",line 2,in <module>
browser = webdriver.Firefox()
File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/firefox/webdriver.py",line 140,in __init__
self.service.start()
File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/common/service.py",line 81,in start
os.path.basename(self.path),self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'geckodriver' executable needs to be in PATH.

Exception ignored in: <bound method Service.__del__ of <selenium.webdriver.firefox.service.Service object at 0x7f3f272d3ac8>>
Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/common/service.py",line 173,in __del__
self.stop()
File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/common/service.py",line 145,in stop
if self.process is None:

 

原因：

未找到firefox浏览器驱动 geckodriver

解决：

下载了Linux的geckodriver

下载地址：https://github.com/mozilla/geckodriver/releases

然后安装

sudo tar zxvf geckodriver-v0.11.1-linux64.tar.gz 
sudo mv geckodriver /usr/bin/    
sudo chmod +x /usr/bin/geckodriver        

再次测试成功