Stange behaviour of admin.ModelAdmin

[jerzyo]

I encounter a strange error when customizing my admin site

{{{class DataFileAdmin(admin.ModelAdmin):

#form = MyDataFileAdminForm
exclude = ('file')}}}

does not remove the field from the form but

{{{class DataFileAdmin(admin.ModelAdmin):

#form = MyDataFileAdminForm
exclude = ('file',)}}}

does.

Could someone explain it to me what is the role of the ending comma? As far as I know Python, it should have no influence on the interpreter

[jerzyo <jerzyo@…>]

Sorry for wrong formatting it should be

class DataFileAdmin(admin.ModelAdmin):
    #form = MyDataFileAdminForm
    exclude = ('file')

class DataFileAdmin(admin.ModelAdmin):
    #form = MyDataFileAdminForm
    exclude = ('file',)

The one one works, the first one does not

[Ramiro Morales]

Duplicate of #12689.