Selenium giving grief: NoneType object is not subscriptable

[Phantom AP1]

Hello fellow Goat acolytes,

All of a sudden a problem has crept into my functional test for the layout and styling and I can't figure it out. I decided to post in the forum instead of fouling up Harry's comment section of his books website even further with my incessant questions.

As far as I can tell it can't complete the math to assert the relative location of the main list inputbox, which in turn is due to Selenium's internals not getting a numerical value for ['x'].
At first I thought it was because I had moved to Python 3.6 and Django 1.11b1 but I made a new virtualenv with Python 3.5.2 and Django 1.10, the setup with which I knew it was working previously.
If I spin up the Django server manually and have a look with Firefox the page looks fine and all the other FTs work (except for the one I'm working on obviously), so I'm at a loss as to what happened.

The error I get is:

======================================================================
ERROR: test_layout_and_styling (functional_tests.test_layout_and_styling.LayoutAndStylingTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/iman/Env/selenium-test/35-test/functional_tests/test_layout_and_styling.py", line 15, in test_layout_and_styling
    inputbox.location['x'] + inputbox.size['width'] / 2,
  File "/home/iman/Env/selenium-test/lib/python3.5/site-packages/selenium/webdriver/remote/webelement.py", line 403, in location
    new_loc = {"x": round(old_loc['x']),
TypeError: 'NoneType' object is not subscriptable

----------------------------------------------------------------------

I tried to do some Python CLI voodoo and I found out that it's specifically the call to inputbox.location that seems to be the problem. I would expect that call to give me a dict with x and y values, right?
Also, yes I know this is slightly different than the book example, but I think it comes down to the same. The get_item_input_box() didn't work in the CLI, said it's not an attribute of the WebDriver object.

>>> inputbox = browser.get_item_input_box()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'WebDriver' object has no attribute 'get_item_input_box'
>>> inputbox = browser.find_element_by_id('id_text')
>>> inputbox.location
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/iman/Env/selenium-test/lib/python3.5/site-packages/selenium/webdriver/remote/webelement.py", line 403, in location
    new_loc = {"x": round(old_loc['x']),
TypeError: 'NoneType' object is not subscriptable
>>> inputbox.id
'da24cd29-d4cb-4777-abd1-8a76c950df33'
>>> inputbox._w3c
True

The last two calls were to be sure that I did actually have a WebDriver object :)

But that's as far as I can get, I don't understand what is happening here. I guess it's a Selenium specific problem? I'll happily continue and just skip over the (arguably silly) layout FT, but would like to eventually get it to work again, because I fear the wrath of the Goat otherwise :(

Kind regards,
Iman van Assum

[Harry Percival]

I saw this problem a coupke of days ago. You need to upgrade geckodriver and selenium i think.

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Harry Percival
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[Richard Bailey]

Yes, I saw this Friday. I can confirm updating gecko driver worked. I had already updated Firefox and selenium. One of those broke things.

[Phantom AP1]

Yeah I am already running latest Selenium so nothing to change there.
I am 1 version behind on geckodriver though, 0.14.0 instead of 0.15.0, will update it and let you know how things are then.

Thanks for the tip!

Op zondag 19 maart 2017 19:22:02 UTC+1 schreef Richard Bailey:

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[Phantom AP1]

Alright, after downloading latest geckodriver I can confirm the following combination works:

Python 3.6.0
Django 1.11b1
Selenium 3.3.1
Geckodriver 0.15.0

Thanks for the help fellas :)

[Devendra Saroj]

Well the above error is because of this piece of code 

inputbox = browser.find_element_by_id('id_text')

You are telling the web driver to find only one element by the id

id_text

hense it isn't subscriptable.

Change it to inputbox = browser.find_elements_by_id('id_text')

and it will work fine. You see the difference there, It's

elements

instead of

 element

.