set Django Form Textatea size

class CourseAttachmentInline(admin.TabularInline):
    model = CourseAttachment
    extra = 1

    def formfield_for_dbfield(self, db_field, **kwargs):
        field = super(CourseAttachmentInline, self).formfield_for_dbfield(db_field, **kwargs)
        if db_field.name in ('subtitle',):
            #field.widget.attrs['rows'] = 3
            #field.widget.attrs['cols'] = 20
            field.widget.attrs = {'rows': 3, 'cols': 50}
        return field

or

class CourseAttachmentInline(admin.TabularInline):
    model = CourseAttachment
    extra = 1

    def formfield_for_dbfield(self, db_field, **kwargs):
        if db_field.name in ('subtitle',):
            return forms.CharField(widget=forms.Textarea(
                attrs={'cols': 50, 'rows': 3},
            ))
        return super(CourseAttachmentInline, self).formfield_for_dbfield(db_field, **kwargs)

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