validate ESC_PAREN ('/') is followed by a callable name and not empty (#12690) When running a single python expression with just a slash - `/`, a tuple is returned. ```python In [1]: / Out[1]: () ``` This weird case happens because when a line starts with `/` the `inputtransformer` transforms it into a call of the first word after the `/` as the callable name and rest tokens after as arguments. This PR fixes that issue by validating that at least a callable name is given and it's not empty, if not a `SyntaxError` will be raised. ```python In [1]: / File "<ipython-input-1-8f27084b6294>", line 1 / ^ SyntaxError: invalid syntax In [2]: ``` Validated that tests are passing.

validate that ESC_PAREN ('/') is followed by a callable name and not empty

FIX: Typing annotations Running `mypy -p IPython.sphinxext` raised a few errors. Fix them and strip some trailing whitespace from a few places.

back to dev

release 8.29.0

Whats new 8.29 (#14560)

Whats new 8.29

Fix line stripping edge case for %load magic command (#14495) Closes: #14494

Refactor with Pathlib for setupbase.py (#14543) Continued efforts for #12515 though it has been closed. Validated to be okay by running the following. - `pip install -e ".[all]"` - `pytest` Please note that there are also some syntactical modifications, and part of them are from the darker linter.

Fix re pattern pretty print (#14559) Alternative to #14558

Fix formatting

Fix line stripping logic

ENH: add webp support to IPython.display.Image and complete identification of JPEG,PNG,GIF,WEBP image types by initial bytes (#14526) - So that `Image('./example.webp')` does not raise a `"Cannot embed the 'webp' image format"` error. - So that matplotlib animations saved as .webp images work (e.g. when ffmpeg+h264 isn't working).

Fix str error in path again

Fix str error in path

Refactor with Pathlib for setupbase.py

DOC: whatsnew/version8.rst: Add support for WEBP to IPython.display.Image

DOC: include WEBP in the display.Image docstring

CLN: remove self. from the _GIF1 and _GIF2 globals

CLN: core/display: reformat per darker