Question

I cannot run ['abc'].append( MyModel.objects.all() ) since it generates exception 'NoneType' object is not iterable if MyModel has no entry.

any workaround or something like ? : in c++

edit:
my statement is actually

','.join([ str(e) for e in ['abc','def'].append( MyModel.objects.all() ) ])

it seems that the problem is caused by append() returning NoneType. I solved this by creating a variable to hold the list and then extend() it

Answer 1

It might be best to be explicit rather than implicit (and avoid using the short circuit propoerties of or which can lead to errors:

my_objects = MyModel.objects.all()
if my_objects:
    [a,b,c].extend(my_objects)