for tga in #django IRC.

tga.py

@contextmanager
def copyable(obj):
  oldval = copy(obj.pk)
  obj.pk = None
  yield obj
  obj.pk = oldval
  
  
with copyable(obj) as tosave:  # I might've forgotten the as part initially.
  newobj = tosave.save()
print(obj.pk)
print(newobj.pk)