Como verificar se a chave primária dada existe no modelo Django

If using the object ---
try:
   obj = model1.objects.get(pk=20)
except DoesNotExist:
   ###do something####
    
Else ----
if model1.objects.filter(pk=20).exists():
   ###do something###
else:
  ###do otherthing###
Noobie Nareshhhh