Line is too long. Django PEP8

It’s “correct”, PEP8 just flags lines over 79 characters long. But if you’re concerned about that, you could write it like this:

field = TreeForeignKey('self',
                       null=True,
                       blank=True,
                       related_name='abcdefgh')

Or this:

field = TreeForeignKey(
    'self',
    null=True,
    blank=True,
    related_name='abcdefgh',
)

Or, really, any other style that would break the single line into multiple shorter lines.

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