TypeError: 'NoneType' object is not subscriptable while invoking execute_script() for Chrome Download Manager through Selenium

manpreet Best Answer 3 years ago

I have been using this function https://stackoverflow.com/a/48267887/11220889 for waiting for downloads to finish and returning the file path once finished. And it has been working great until now.

The Function

def every_downloads_chrome(driver):
    if not driver.current_url.startswith("chrome://downloads"):
        driver.get("chrome://downloads/")
    return driver.execute_script('''
        var items = downloads.Manager.get().items_;
        if (items.every(e => e.state === "COMPLETE"))
            return items.map(e => e.file_url);
        ''')

How its called

paths = WebDriverWait(driver, 120, 1).until(every_downloads_chrome)

Error I'm receiving

TypeError: 'NoneType' object is not subscriptable

So from what I can gather something has changed that has started causing the function to not return a path. I believe this is due to a change within chrome or even more specifically the chrome driver. My two reasons for this assumption is:

1) I had this function in another code that my colleague was using and she called me saying it was producing this error yesterday.

2)Neither code has changed so the change must be in chrome

I would like to keep using this script but if not possible have another function that waits for the downloads to finish and returns the paths and ideally does it all through the driver not through file path since multiple users use my codes on multiple machines.

EDIT: Versions-

Name: selenium
Version: 3.141.0

Name: Chrome Browser
Version: 73.0.3683.86

Name: Chrome Driver
Version: 2.43.600210

Name: System
Version: Windows 10 Pro x64

manpreet 3 years ago

manpreet 3 years ago

As per the error message:

TypeError: 'NoneType' object is not subscriptable

Your main issue seems to be incompatibility between the version of the binaries you are using as follows: