The story of failing to update "calendar.day_abbr" on the admin screen of django

Models can no longer be added / updated / deleted from the django admin screen

The screen can be displayed and operated, but the following exception occurs when the update button is pressed.

"AttributeError: 'calendar' object has no attribute 'day_abbr'"

Caused by the application name calendar

The bottom line is that there was an application named calendar.

It seems that this caused batting with the existing calendar and failed.

I know if it fails with the class name, but I didn't expect it to fail with the application name, so it took some time to find out the cause ...

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