[Python] How do you find location of "download" button on web page to provide to Python...

I'm new at using Python for web scraping. Basically, what I need to do is to find the location of a "download" button and provide this location to the Python code. The location should look similar to this:

/html/body/div[3]/div/div[3]/div[2]/div/div[1]/div/div/div[1]/div/div[3]/div[1]/div/ul[2]/li[3]/div/div[1]/button/span

Can somebody tell me how to obtain this location? Thanks.

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