IPython change input cell syntax highlighting logic for entire session

Question

You can use extensions or display helpers in IPython to make whatever syntax highlighting you\'d like on output cells.

For some special cell magics, like

Answer 1

To replace IPython.config.cell_magic_highlight, you can use something like

import IPython
js = "IPython.CodeCell.config_defaults.highlight_modes['magic_fortran'] = {'reg':[/^%%fortran/]};"
IPython.core.display.display_javascript(js, raw=True)

so cells which begin with %%fortran will be syntax-highlighted like FORTRAN. (However, they will still be evaluated as python if you do only this.)