Сергей Горностаев

try (PrintWriter out = new PrintWriter("files/out.txt")) {
    out.print(String.join(System.lineSeparator(), result));
}

@admin.register(SomeModel)
SomeModelAdmin(admin.ModelAdmin):
    def get_fields(self, request, obj=None):
        fileds = super().get_fields(request, obj)
        if obj and not obj.first_field:
            fields.remove('second_field_name')
        return fields

response = Response(stream_with_context(req.iter_content()), mimetype='audio/mpeg')
response.headers['Content-Disposition'] = 'attachment; filename=some_file_name.mp3'
return response

class QuestionForm(ModelForm):
    class Meta:
        model = Question
        fields = '__all__'
        widgets = {
            'field_name': TextInput(attrs={'placeholder': 'some value'}),
        }