[Fixed]-NameError: name 'BookAdmin' is not defined …Django

You are trying to register BookAdmin before actually creating it. Just move admin.site.register(Book, BookAdmin) after the class definition and it will work as expected.

class BookAdmin(admin.ModelAdmin):
    fieldsets = [
        (None,              {'fields': ['publication_date']}),
        ('Date infomation', {'fields': ['publisher']}),
    ]

admin.site.register(Book, BookAdmin)

It looks like you are trying to register BookAdmin before it’s definition. When the line admin.site.register(Book, BookAdmin) runs, the class BookAdmin hasn’t been defined yet.

Re-arrange the code slightly so you have:

class BookAdmin(admin.ModelAdmin):
    fieldsets = [
    (None,              {'fields': ['publication_date']}),
    ('Date infomation', {'fields': ['publisher']}),
    ]

admin.site.register(Book, BookAdmin)