selenium.common.exceptions.TimeoutException 错误使用 WebDriverWait 通过 Selenium 和 Python

Question

Traceback (most recent call last):
  File "Inventorytest.py", line 88, in <module>
    j.go_to_application()
  File "Inventorytest.py", line 65, in go_to_application
    EC.element_to_be_clickable((By.ID, 'FavoriteApp_ITEM'))
  File "/home/naroladev/Mercury_Back-End/mercuryenv/lib/python3.6/site-packages/selenium/webdriver/support/wait.py", line 80, in until
    raise TimeoutException(message, screen, stacktrace)
selenium.common.exceptions.TimeoutException: Message: 

I got above exception with EC2 server instance. My script works absolutely fine with Ubuntu and Mac os with any version of firefox and geckodriver on local system. But got above error with EC2 ubuntu 18.04.01 version, in this I have also tried upgrade and downgrade firefox and geckodriver versions but still not work. Can anyone help me out with suggestion and solutions.

Answer 1

This error message...

Traceback (most recent call last):
  File "Inventorytest.py", line 88, in <module>
    j.go_to_application()
  File "Inventorytest.py", line 65, in go_to_application
    EC.element_to_be_clickable((By.ID, 'FavoriteApp_ITEM'))
  File "/home/naroladev/Mercury_Back-End/mercuryenv/lib/python3.6/site-packages/selenium/webdriver/support/wait.py", line 80, in until
    raise TimeoutException(message, screen, stacktrace)
selenium.common.exceptions.TimeoutException: Message: 

...implies that the WebDriver variant was unable to locate the desired WebElement within the timeframe for which the WebDriverWait was constructed.

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WebDriverWait

The WebDriverWait constructor takes a WebDriver instance as an argument and timeout in seconds.

Hence, irrespective of usage of either of the expected_conditions , WebDriverWait on failure will result in TimeoutException .

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This usecase

In this usecase, the line:

EC.element_to_be_clickable((By.ID, 'FavoriteApp_ITEM'))

was unable to identify the desired element within the desired time frame hence you faced TimeoutException .

However, from TimeoutException it will be tough to dig out the actual result of the failure.

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Solution

As a solution to know about the exact cause of the failure, you need to remove the WebDriverWait and replace the line of code with either:

• find_element_by_class_name(name)
• find_element_by_css_selector(css_selector)
• find_element_by_id(id)
• find_element_by_link_text(link_text)
• find_element_by_name(name)
• find_element_by_partial_link_text(partial_link_text)
• find_element_by_tag_name(tag_name)
• find_element_by_xpath(xpath)

If required you can slow down the search inducing waits through time.sleep(secs) while debugging.

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References

You can find a couple of relevant discussions in:

• selenium.common.exceptions.TimeoutException while invoking.click() on an element through expected_conditions
• ExpectedConditions.ElementIsVisible returns TimeoutException even when element is present