Python progress bar from callback function

Question

From what I've seen progress bars mostly work by wrapping an iterable or something the like. I'm trying to get a progress bar from a callback function from another module.

The module is doing calculating on data and you can define a callback that uses three arguments: (file being worked on, current piece, total pieces)

Just for fun I did this:

def callback(filename, pc, num_pieces):
    print(f'{filename} - {pc} - {num_pieces}')

As expected, you get thousands of prints with increasing piece number: The file name also changes during the progress, but it's not important for my purposes.

How would you define and use the callback to create a progress bar for a CLI application?

can you just call tqdm.update after each invocation of the callback? — modesitt
– modesitt, Commented Mar 31, 2020 at 17:00

Remy · Accepted Answer · 2020-09-30 13:40:42Z

2

I have done something similar with TQDM.

If you have a classical callback, change it into update_to function, it would look somewhat like mine:

class DownloadProgressBar(tqdm):
    def update_to(self, current, total):
        self.total = total
        self.update(current - self.n)

And register the callback regularly with your DownloadProgressBar.

with DownloadProgressBar(unit='B', unit_scale=True) as t:
            client.download_media(media, filepath , progress_callback=t.update_to)

For more information look up at their Official docs.

( Keep in mind my example is showing a callback on a single file )

answered Sep 30, 2020 at 13:40

Remy

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