我正在使用Python 2.7，Selenium 2.35和Firefox 22.0。当我做：
from selenium import webdriver
d = webdriver.Firefox()
Firefox浏览器将打开并保持打开状态。控制台中引发以下错误：
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "c:\Python27\lib\site-packages\selenium\webdriver\firefox\webdriver.py", line 61, in __init__
desired_capabilities=capabilities)
File "c:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 72, in __init__
self.start_session(desired_capabilities, browser_profile)
File "c:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 114, in start_session
'desiredCapabilities': desired_capabilities,
File "c:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 165, in execute
self.error_handler.check_response(response)
File "c:\Python27\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 136, in check_response
raise exception_class(value)
selenium.common.exceptions.WebDriverException: Message: u''
然后，我启动了Fiddler并尝试再次初始化webdriver.Firefox对象：
d = wedriver.Firefox()
与上述相同的错误。Fiddler显示以下输出：
{"name":"newSession","status":13,"value":{"message":"b is undefined","stackTrace":[{"methodName":"wdSessionStoreService.prototype.extractCapabilitySetting_",
"fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/session_store.js",
"lineNumber":7951},{"methodName":"wdSessionStoreService.prototype.createSession",
"fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/session_store.js",
"lineNumber":7944},{"methodName":"nsCommandProcessor.prototype.newSession",
"fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/command_processor.js",
"lineNumber":10982},{"methodName":"nsCommandProcessor.prototype.execute",
"fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/command_processor.js",
"lineNumber":10875},{"methodName":"Dispatcher.executeAs/<",
"fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/driver_component.js",
"lineNumber":7750},{"methodName":"Resource.prototype.handle",
"fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/driver_component.js",
"lineNumber":7896},{"methodName":"Dispatcher.prototype.dispatch",
"fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/driver_component.js","lineNumber":7843},{"methodName":"WebDriverServer/<.handle","fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/driver_component.js","lineNumber":10710},{"fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/httpd.js","lineNumber":1935},{"methodName":"ServerHandler.prototype.handleResponse","fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/httpd.js","lineNumber":2261},{"methodName":"Connection.prototype.process","fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/httpd.js","lineNumber":1168},{"methodName":"RequestReader.prototype._handleResponse","fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/httpd.js","lineNumber":1616},{"methodName":"RequestReader.prototype._processBody","fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/httpd.js","lineNumber":1464},{"methodName":"RequestReader.prototype.onInputStreamReady",
"fileName":"file:///c:/users/username/appdata/local/temp/tmpzqvpr1/extensions/[email protected]/components/httpd.js","lineNumber":1333}]}}
如果我加载，localhost:57554我得到：
httpd.js
If you're seeing this page, httpd.js is up and serving requests! Now set a base path and serve some files!
因此，Webdriver似乎可以正常工作，但是由于某些原因Python无法启动会话。有人以前有过这个问题吗？是什么原因造成的？
此问题是由HTTP_PROXY环境变量引起的。通过控制面板更改Windows设置不会更改环境变量的值。在实例化webdriver之前从Python环境中删除变量可解决此问题：
import os
if 'HTTP_PROXY' in os.environ:
os.environ.pop('HTTP_PROXY')
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我来说两句