define extras_require in setup.py

[gnikk]

First I defined this dictionary and its keys, then If I have a spell problem in writing keys, I won't get an error and everything seem successfully.
Is there any solution for warning this error?
and for the default option, I want to install my package without any parameter. Is it possible?

[webknjaz]

Could you please add more details and examples? I'm not sure what you're asking. FWIW Pip warns about non-existent extras. Also, normal install_requires are always pulled in by pip when it resolves the deps.