Hi,

It is easy to integrate tqdm with urllib when downloading a file, but when something is being uploaded, it is not so easy. One needs to intercept .read() or .write() calls and update tqdm manually.

I needed it in b2 command line tool, so I have implemented it there, but maybe a stream wrapper could be useful for other tqdm users? This code is more specific to tqdm than to b2 command line tool.

Do you want to support progress tracking of data streams?