[REQUEST] rich Pretty: truncate long variables

How would you improve Rich?

Hi,

I’m using Pretty to style the locals panels in pyinspect’s tracebacks. However when the object being printed is a list, or a dictionary whose values are long lists/arrays Pretty prints the whole thing, cluttering the console and defeating the purpose of trying to have more informative tracebacks.

I don’t if I’ve missed this option, but it would be great if there was a way to truncate long objects when printing them. (I’ve tried using the overflow argument but didn’t make a difference.

Here’s some code to reproduce the issue:

from rich.pretty import Pretty
from rich.console import Console

my_list = [1] * 400

Console().print(Pretty(my_list))

Ideally it would only print the start of the list.

Thank you, Federico

[willmcgugan]

The simplest approach may be to set a limit of n items to all containers however they are nested. Then show ‘n’ items plus an ellipsis (perhaps with text like ... +23

@fakhrip raises a good point about long strings, and I like the solution.

It’s never going to be perfect, even with the above, you could have a very large pretty printed data-structure. But would work for the most part.

I think the Pretty class would have to grow “max_items” and “max_string_size” arguments, which should be optional.

Note that there is a ellipsis unicode character, so … can be replaced with …

You can see the difference with a fixed width font.

...
…

@fakhrip This would be a tricky change! If you are still interested, have a look at pretty.py

[hhoeflin]

Thank you - I have been looking for this abbreviation option. I saw it in pretty, but could not find how to enable it in the logging Handler. Is that possible as well? Thanks!