[BUG] WebDriver Exception when Testing Dash App

[erb13020]

Thank you so much for helping improve the quality of Dash!

We do our best to catch bugs during the release process, but we rely on your help to find the ones that slip through.

Describe your context
Please provide us your environment so we can easily reproduce the issue.

• replace the result of pip list | grep dash below

dash                   1.17.0
dash-core-components   1.13.0
dash-html-components   1.1.1
dash-renderer          1.8.3
dash-table             4.11.0

• if frontend related, tell us your Browser, Version, and OS

  • OS: Linux Ubuntu 18.04
  • Browser chrome

Describe the bug

I'm currently trying to run Pytest to test the app's front end that I'm building. I've followed the guide at

https://dash.plotly.com/testing

However, I cannot run my tests because either Pytest or Dash isn't recognizing my Chromedriver. When I run

python3.6 -m pytest --webdriver Chrome -k test_one tests/dataviz/test_dataviz.py

I get the following error.

ERROR dash.testing.browser:browser.py:415 <<<Webdriver not initialized correctly>>>

and

FileNotFoundError: [Errno 2] No such file or directory: 'chromedriver': 'chromedriver'

and

selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH.

It looks like Selenium or Pytest cannot find my chromedriver file, even though I've downloaded it to my project, app, and test directories. I've used Selenium before and know that you have to specify where your chrome file is with something like

browser = webdriver.Chrome(executable_path="/file/path/goes/here/)

But I'm not sure where to put that or what I have to do to get Pytest and Dash to recognize my ChromeDriver.

My File Structure (Front End)

├── chromedriver
├── dataviz
│   ├── app.py
│   ├── chromedriver
│   ├── Dockerfile
│   ├── init.py
│   ├── pycache
│   │   ├── app.cpython-36.pyc
│   │   └── init.cpython-36.pyc
│   ├── README.md
│   └── requirements.txt
├── README.md
├── requirements.txt
└── tests
├── conftest.py
├── dataviz
│   ├── chromedriver
│   ├── init.py
│   ├── pycache
│   │   ├── init.cpython-36.pyc
│   │   ├── test_dataviz.cpython-36-pytest-6.0.1.pyc
│   │   └── test_dataviz.cpython-36-pytest-6.1.2.pyc
│   └── test_dataviz.py

Everything in bold is related to the front end/testing of my app.

My Tests / Set Up

tests/dataviz/test_dataviz.py

from dash.testing.application_runners import import_app

def test_one(dash_duo):
    app = import_app("dash_test.app")

    dash_duo.start_server(app)
    assert dash_duo.get_logs() == [], "browser console should contain no error"

tests/conftest.py

from selenium.webdriver.chrome.options import Options


def pytest_setup_options():

    # Set up some options for how we want the Chrome webdriver to be configured
    options = Options()
    options.add_argument('--disable-gpu')
    options.add_argument('--headless')
    options.add_argument('--no-sandbox')
    options.add_argument('--disable-dev-shm-usage')

    return options

** Full Error Message **

Run python3.6 -m pytest --webdriver Chrome -k test_one tests/dataviz/test_dataviz.py

Test session starts (platform: linux, Python 3.6.9, pytest 6.0.1, pytest-sugar 0.9.4)
rootdir: /home/ebeb9/PycharmProjects/Social-Media-Public-Analysis
plugins: webdriver-1.7.0, mock-3.2.0, sugar-0.9.4, dash-1.17.0
collecting ... 

――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― ERROR at setup of test_one ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

request = <SubRequest 'dash_duo' for <Function test_one>>, dash_thread_server = <dash.testing.application_runners.ThreadedRunner object at 0x7f1082c74710>, tmpdir = local('/tmp/pytest-of-ebeb9/pytest-66/test_one0')

    @pytest.fixture
    def dash_duo(request, dash_thread_server, tmpdir):
        with DashComposite(
            dash_thread_server,
            browser=request.config.getoption("webdriver"),
            remote=request.config.getoption("remote"),
            remote_url=request.config.getoption("remote_url"),
            headless=request.config.getoption("headless"),
            options=request.config.hook.pytest_setup_options(),
            download_path=tmpdir.mkdir("download").strpath,
            percy_assets_root=request.config.getoption("percy_assets"),
            percy_finalize=request.config.getoption("nopercyfinalize"),
>           pause=request.config.getoption("pause"),
        ) as dc:

../../.local/lib/python3.6/site-packages/dash/testing/plugin.py:151: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
../../.local/lib/python3.6/site-packages/dash/testing/composite.py:6: in __init__
    super(DashComposite, self).__init__(**kwargs)
../../.local/lib/python3.6/site-packages/dash/testing/browser.py:61: in __init__
    self._driver = until(self.get_webdriver, timeout=1)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

wait_cond = <bound method Browser.get_webdriver of <dash.testing.composite.DashComposite object at 0x7f1082cd9748>>, timeout = 1, poll = 0.1, msg = 'expected condition not met within timeout'

    def until(
        wait_cond, timeout, poll=0.1, msg="expected condition not met within timeout"
    ):  # noqa: C0330
        res = wait_cond()
        logger.debug(
            "start wait.until with method, timeout, poll => %s %s %s",
            wait_cond,
            timeout,
            poll,
        )
        end_time = time.time() + timeout
        while not res:
            if time.time() > end_time:
>               raise TestingTimeoutError(msg)
E               dash.testing.errors.TestingTimeoutError: expected condition not met within timeout

../../.local/lib/python3.6/site-packages/dash/testing/wait.py:25: TestingTimeoutError
----------------------------------------------------------------------------------------------------- Captured log setup ------------------------------------------------------------------------------------------------------
ERROR    dash.testing.browser:browser.py:415 <<<Webdriver not initialized correctly>>>
Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 76, in start
    stdin=PIPE)
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'chromedriver': 'chromedriver'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 413, in get_webdriver
    return getattr(self, "_get_{}".format(self._browser))()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 456, in _get_chrome
    else webdriver.Chrome(options=options, desired_capabilities=capabilities)
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__
    self.service.start()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 83, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

ERROR    dash.testing.browser:browser.py:415 <<<Webdriver not initialized correctly>>>
Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 76, in start
    stdin=PIPE)
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'chromedriver': 'chromedriver'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 413, in get_webdriver
    return getattr(self, "_get_{}".format(self._browser))()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 456, in _get_chrome
    else webdriver.Chrome(options=options, desired_capabilities=capabilities)
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__
    self.service.start()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 83, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

ERROR    dash.testing.browser:browser.py:415 <<<Webdriver not initialized correctly>>>
Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 76, in start
    stdin=PIPE)
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'chromedriver': 'chromedriver'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 413, in get_webdriver
    return getattr(self, "_get_{}".format(self._browser))()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 456, in _get_chrome
    else webdriver.Chrome(options=options, desired_capabilities=capabilities)
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__
    self.service.start()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 83, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

ERROR    dash.testing.browser:browser.py:415 <<<Webdriver not initialized correctly>>>
Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 76, in start
    stdin=PIPE)
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'chromedriver': 'chromedriver'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 413, in get_webdriver
    return getattr(self, "_get_{}".format(self._browser))()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 456, in _get_chrome
    else webdriver.Chrome(options=options, desired_capabilities=capabilities)
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__
    self.service.start()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 83, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

ERROR    dash.testing.browser:browser.py:415 <<<Webdriver not initialized correctly>>>
Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 76, in start
    stdin=PIPE)
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'chromedriver': 'chromedriver'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 413, in get_webdriver
    return getattr(self, "_get_{}".format(self._browser))()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 456, in _get_chrome
    else webdriver.Chrome(options=options, desired_capabilities=capabilities)
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__
    self.service.start()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 83, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

ERROR    dash.testing.browser:browser.py:415 <<<Webdriver not initialized correctly>>>
Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 76, in start
    stdin=PIPE)
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'chromedriver': 'chromedriver'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 413, in get_webdriver
    return getattr(self, "_get_{}".format(self._browser))()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 456, in _get_chrome
    else webdriver.Chrome(options=options, desired_capabilities=capabilities)
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__
    self.service.start()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 83, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

ERROR    dash.testing.browser:browser.py:415 <<<Webdriver not initialized correctly>>>
Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 76, in start
    stdin=PIPE)
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'chromedriver': 'chromedriver'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 413, in get_webdriver
    return getattr(self, "_get_{}".format(self._browser))()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 456, in _get_chrome
    else webdriver.Chrome(options=options, desired_capabilities=capabilities)
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__
    self.service.start()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 83, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

ERROR    dash.testing.browser:browser.py:415 <<<Webdriver not initialized correctly>>>
Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 76, in start
    stdin=PIPE)
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'chromedriver': 'chromedriver'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 413, in get_webdriver
    return getattr(self, "_get_{}".format(self._browser))()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 456, in _get_chrome
    else webdriver.Chrome(options=options, desired_capabilities=capabilities)
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__
    self.service.start()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 83, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

ERROR    dash.testing.browser:browser.py:415 <<<Webdriver not initialized correctly>>>
Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 76, in start
    stdin=PIPE)
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'chromedriver': 'chromedriver'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 413, in get_webdriver
    return getattr(self, "_get_{}".format(self._browser))()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 456, in _get_chrome
    else webdriver.Chrome(options=options, desired_capabilities=capabilities)
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__
    self.service.start()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 83, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

ERROR    dash.testing.browser:browser.py:415 <<<Webdriver not initialized correctly>>>
Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 76, in start
    stdin=PIPE)
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'chromedriver': 'chromedriver'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 413, in get_webdriver
    return getattr(self, "_get_{}".format(self._browser))()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 456, in _get_chrome
    else webdriver.Chrome(options=options, desired_capabilities=capabilities)
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__
    self.service.start()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 83, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

ERROR    dash.testing.browser:browser.py:415 <<<Webdriver not initialized correctly>>>
Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 76, in start
    stdin=PIPE)
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'chromedriver': 'chromedriver'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 413, in get_webdriver
    return getattr(self, "_get_{}".format(self._browser))()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/dash/testing/browser.py", line 456, in _get_chrome
    else webdriver.Chrome(options=options, desired_capabilities=capabilities)
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__
    self.service.start()
  File "/home/ebeb9/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 83, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home
                                                                                                                                                                                                                100% ██████████
=================================================================================================== short test summary info ===================================================================================================
FAILED tests/dataviz/test_dataviz.py::test_one - dash.testing.errors.TestingTimeoutError: expected condition not met within timeout

Results (1.33s):
       1 error

** Full Source Code / Repo **

Our repository/branch for the Front end using Dash can be found at

https://github.com/Social-Media-Public-Analysis/Social-Media-Public-Analysis/tree/dataviz

Thank you and I hope this was enough information!

[anders-kiaer]

@erb13020 I think the most reliable approach is to put the chromedriver into your $PATH. This way you can reuse it across different projects/folders using selenium, you keep it out of the source code repository, and it is also what selenium suggests in the traceback:

selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

E.g. if your are using bash something like

export PATH=$PATH:/path/to/your/folder/with/chromedriver

[erb13020]

Thank you @anders-kiaer . This fixed my issue.