[Python] Progress Bar while download file over http with Requests

I need to download a sizable (~200MB) file. I figured out how to download and save the file with here. It would be nice to have a progress bar to know how much has been downloaded. I found ProgressBar but I'm not sure how to incorporate the two together.

Here's the code I tried, but it didn't work.

bar = progressbar.ProgressBar(max_value=progressbar.UnknownLength)
with closing(download_file()) as r:
for i in range(20):
bar.update(i)

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