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from django.http import Http404
def get_int_or_error(reqmap, paramname, default=None, allow_negative=False):
if paramname not in reqmap:
if default:
return default
raise Http404("Parameter {} missing".format(paramname))
p = reqmap.get(paramname)
if allow_negative and p.startswith('-'):
p = p[1:]
negative = -1
else:
negative = 1
if not p.isnumeric():
raise Http404("Parameter {} is not an integer".format(paramname))
return int(p) * negative
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