No kernel for grammar MagicPython found
atom 1.27
Hydrogen 2.5
mac os 10.13.4 (17E202)
run cmd+enter raise No kernel for grammar MagicPython found
In Hydrogen's settings, see Language Mappings. For MagicPython, setting Language Mappings to {"python": "magicpython"} should do the trick.
@n-riesco raise other error

@lovezeropython See the troubleshooting guide. It's described in the first section.
I had the same issue and @n-riesco 's solution to set the Language Mappings to {"python": "magicpython"} worked for me
This should be fixed for the future in https://github.com/nteract/hydrogen/pull/1368 and will go out in the next release.