instead of using two for loops in python

Question

for pro in product:
    for ser in service:
        if (
            pro['attributes']['code']
            == ser['relationships']['service']['data']['id']
        ):
            service_attributes.append(ser['attributes']['service-parameters'])
        else:
            service_attributes.append(None)

Answer 1

This example might help:

for x, y in ((a,b) for a in [1,2,3] for b in [5,6,7]):
  print x, y