from baseapp import BaseNbGraderApp, BaseNbConvertApp
from nbgraderapp import NbGraderApp
from assignapp import AssignApp
from autogradeapp import AutogradeApp
from feedbackapp import FeedbackApp
from notebookapp import FormgradeNotebookApp
from formgradeapp import FormgradeApp
from submitapp import SubmitApp
from validateapp import ValidateApp

__all__ = [
    'BaseNbGraderApp',
    'BaseNbConvertApp',
    'NbGraderApp',
    'AssignApp',
    'AutogradeApp',
    'FeedbackApp',
    'FormgradeApp',
    'FormgradeNotebookApp',
    'SubmitApp',
    'ValidateApp'
]

from .baseapp import BaseNbGraderApp, BaseNbConvertApp
from .nbgraderapp import NbGraderApp
from .assignapp import AssignApp
from .autogradeapp import AutogradeApp
from .feedbackapp import FeedbackApp
from .notebookapp import FormgradeNotebookApp
from .formgradeapp import FormgradeApp
from .submitapp import SubmitApp
from .validateapp import ValidateApp

__all__ = [
    'BaseNbGraderApp',
    'BaseNbConvertApp',
    'NbGraderApp',
    'AssignApp',
    'AutogradeApp',
    'FeedbackApp',
    'FormgradeApp',
    'FormgradeNotebookApp',
    'SubmitApp',
    'ValidateApp'
]

Fix imports