Increase the timing precision of progress bar

[dachengx]

What is the problem / what does the code in this PR do

To solve #816

Can you briefly describe how it works?

Can you give a minimal working example (or illustrate with a figure)?

Please include the following if applicable:

• Update the docstring(s)
• Update the documentation
• Tests to check the (new) code is working as desired.
• Does it solve one of the open issues on github?

Please make sure that all automated tests have passed before asking for a review (you can save the PR as a draft otherwise).

[coveralls]

coverage: 91.494% (+0.001%) from 91.493%
when pulling f9a185e on high_precision_pbar
into a1e921f on master.

[yuema137]

@dachengx Thanks for this PR and thanks for catching this issue @zaitsev136
Looking at #816 and this PR, I agree that it's a better solution to use an independent attribute. The last_print_t is an attribute provided by tqdm which is updated with time.time in __iter__. So when we do

strax/strax/context.py

Line 1473 in a1e921f

yield result

or

strax/strax/context.py

Line 1552 in a1e921f

pbar.update(0)

The pbar.last_print_t will be overwritten by time.time. As we don't want to touch the inner side of tqdm it's good to separate the high-resolution time calculation with a different one.

[dachengx]

Let's wait for @zaitsev136 's review.

[zaitsev136]

Looking good, thanks a lot for looking into this

[dachengx]

Looking good, thanks a lot for looking into this

Will this PR solve the error you saw?

[zaitsev136]

yes, it will