Question

Hi I have a Django function:

def get_spans(angle):
    spans = Spans.objects.values_list('span').filter(
        max_roof_angle=angle,
    )
    try:
        max_span = max(spans)
    except ValueError:
        max_span = 0
    return max_span

My question is – why does this return a tuple? How do I ensure I am getting a single, integer value back?

Any help much appreciated.

Answer 1

From the documentation: you can get a flat list using the arg flat=True. If you try to get the max from a list you would get a single value which you need

def get_spans(angle):
    spans = Spans.objects.values_list('span', flat=True).filter(
        max_roof_angle=angle,
    )
    max_span = max(spans)
    return max_span