[Python-ideas] Re: else without except

June 30, 2023


      On 2023-06-30 14:55, Daniel Walker wrote:
...
As most of you probably know, you can use else with try blocks:
try:
     do_stuff()
except SomeExceptionClass:
    handle_error()
else:
    no_error_occurred()
Here, no_error_occurred will only be called if do_stuff() didn't raise 
an exception.
However, the following is invalid syntax:
try:
    do_stuff()
else:
    no_error_occurred()
Now you might say that this isn't needed as you can achieve the same 
result with
do_stuff()
no_error_occurred()
However, what if I want to use finally as well:
try:
    do_stuff()
else:
    no_error_occurred()
finally:
    cleanup()
and I need no_error_occurred to be called before cleanup?  For my actual 
use case, I've done
try:
    do_stuff()
except Exception:
     raise
else:
    no_error_occurred()
finally:
    cleanup()
This seems very non-Pythonic.  Is there a reason why else without except 
has to be invalid syntax?
What would be the difference between

     try:
        do_stuff()
     else:
        no_error_occurred()
     finally:
        cleanup()

and

     try:
        do_stuff()
        no_error_occurred()
     finally:
        cleanup()

?

[Python-ideas] Re: else without except

MRAB