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javascript python selenium

Webdriver in Python – Executing External JavaScript

I like to execute a JavaScript in webdriver in python.
Unfortunately they way I try to implement it does not work.
How can I correctly do it?

The respective documentary states:
(http://selenium-python.readthedocs.org/en/latest/api.html)

driver.execute_script(‘document.title’)

So I wrote the following python code:

driver = webdriver.Firefox()    
driver.get("http://google.com")
driver.execute_script("./hello_world.js")
driver.quit()

With the respective hello_world.js within the same directory:

alert('Hello, World!')

Yet, unfortunately it yields a Message syntax error:

Log:

Traceback (most recent call last):
File "/sinonJS_test.py", line 44, in <module>
sinon_test()
File "/sinonJS_test.py", line 35, in sinon_test
driver.execute_script("./hello_world.js")
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 401, in execute_script
{'script': script, 'args':converted_args})['value']
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 173, in execute
self.error_handler.check_response(response)
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py", line 166, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: syntax error
Stacktrace:
at handleEvaluateEvent (http://google.com:68:11)

Solution attemps:
1) Tried to permute hello_world.js file path description, like adding/removing file suffix,
adding/removing absolute file path. Not working.

Note: Indeed I researched several answered threads to similar questions here
on SO, yet none of them appeared to solve my problem. E.g. some involving only
very small scripts solved the issue by stating the JavaScript as a string within
the actual python code. This is not a not an option to me, as I nee to execute bigger
more complex JavaScripts (Sinon Fake Timers).

Like this one:
Selenium Webdriver: execute_script can’t execute custom methods and external javascript files