I have a query where I used exception:
try:
sm = Something.objects.get(id=5)
except Something.DoesNotExist:
pass
Here what does pass do ? I mean what if my whole view depends on sm and it does not get sm . Should I set "sm" manually like:
except Something.DoesNotExist:
sm = anything
I just want to know what do pass do if it dont find whats queried. If it just ignore the part after except and go further then whats the point because my whole view depends on sm
Thank you
The keyword pass in the above context ignores DoesNotExist exception. If your program depends on the existence of sm somewhere down in your code, you should set it to None and check its value where you need it.
try:
sm = Something.objects.get(id=5)
except Something.DoesNotExist:
sm = None
if sm:
...
Alternatively, you can do your job in the else part of your try/catch block. It is executed only when the code in try block doesn't raise an exception.
try:
sm = Something.objects.get(id=5)
except Something.DoesNotExist:
# do something here..
else:
print sm
...
something = get_object_or_404(Something, id=5)
get_object_or_default(Something, id=5, default="someone").class property, maybe something like Something.DEFAULT_PHONE_NO, so you'll be able to use it even when sm isn't created.pass is a null statement that does nothing, and is useful when you need a statement due to indentation rules, but don't want to write the code yet.
If you removed it to have the code:
try:
sm = Something.objects.get(id=5)
except Something.DoesNotExist:
It would fail with a syntax error.
As for what to do if you don't find the item you are looking for, that very much depends on the rest of the code. However, in a case like this it would be better to show an error to someone as thats what has happened - you've requested an item that doesn't exist.
pass is the no-op and does nothing. It need to be in the except block to conform python syntax.
