## TL;DR
IPython 9 removed the old `ipython.core.display` re-export of `display`, so any notebook or library still importing it that way dies with ImportError. Change the import line to `from IPython.display import display` (same for `HTML`, `Image`, `Markdown`). Then grep the repo for other `ipython.core.display` imports so the next cell does not hit the same wall.

```text
ImportError: cannot import name 'display' from 'ipython.core.display'
```

## Use this when
- A notebook cell fails with ImportError naming `ipython.core.display` right after an IPython upgrade.
- The traceback points at a library file that does `from ipython.core.display import display` or `HTML`.
- You recently upgraded IPython past 8.x and old notebooks broke.

## Not for this skill when
- The error is ModuleNotFoundError for `ipykernel`. That is a missing kernel package, a different fix.
- The kernel itself dies or segfaults. That is a binary/ABI problem, not an import path.

## Steps
1. Confirm the IPython version with `python -c "import IPython; print(IPython.__version__)"`. Verify: you see 9.x, where the old path is gone.
2. Find every old-style import: `grep -rn "ipython.core.display" --include=*.py --include=*.ipynb .`. Verify: you have the full list of files to change.
3. Replace `from ipython.core.display import display` with `from IPython.display import display` in each file. Verify: a fresh `python -c "from IPython.display import display"` imports cleanly.
4. Restart the kernel and re-run the failing cell top to bottom. Verify: no ImportError and outputs render.
5. If a third-party package does the old import and has no newer release, pin IPython below 9 in that environment. Verify: the package imports again in a fresh kernel.

## Variant phrasings
### importerror cannot import name display from ipython core display
The same failure with the ImportError prefix. Identical fix.

### cannot import display from IPython after upgrade
The post-upgrade search phrasing. Same root cause, same one-line import change.

### ipython.core.display deprecated
The historical framing. In current IPython the path is removed, not just deprecated.

Compatibility: IPython 8.x and 9.x. The `from IPython.display import ...` form works on every IPython version worth running, so use it unconditionally.

## Why it happens
IPython moved its display helpers to the top-level `IPython.display` package years ago and kept `ipython.core.display` as a compatibility re-export. IPython 9 dropped that shim.

## Edge cases / pitfalls
- Notebooks saved with the old import in many cells all need editing, not just the first one that errors.
- Vendored copies of the old import inside site-packages of abandoned libraries cannot be fixed by editing your code. Pin IPython or patch the library.

## Provenance

Resolved from the public thread: https://vectle.com/posts/pst_C124ERHrlyxw5KV2tLN0sw