improvement: add param to show dtypes in table header

[Light2Dark]

📝 Summary

Fixes #2902 . Pass a show_data_types param in mo.ui.table() to control display of dtypes.

If we are not keen to add another param, we could make this a global config instead.

🔍 Description of Changes

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

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Name	Status	Preview	Comments	Updated (UTC)
marimo-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 21, 2025 5:07pm

[manzt]

I'm not sure I see the dypes in the example screenshot. Is it showing the dtypes disabled? Personally, rather than having some config I'd be open to be more opinionated and just always showing the dtype, is there a case where we wouldn't want to show it?

[Light2Dark]

Yeah, by default it is shown. There have been requests to hide it like #2902 .

Default:

With show_data_types=False,

[manzt]

Ah I see, I forgot the app/presentation use case. I'd argue that dtypes are necessary in edit mode to understand what your datatypes are.

[Light2Dark]

We could also hide it in app mode and not expose this as a parameter. But that will be a change in current behaviour, instead of making it opt-in.

[mscolnick]

i think configurable is ok since its been requested a few times on Discord as well.

[github-actions]

🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.14.13-dev18