Try in python, repeat if error but not inside a loop?

Question

So I have a function I want to run, however this function connects to a serial device, if the device was not turned off correctly it will return an error if you try to run such a function. Since I only need to run the function once all I want is to

try
   #function
except
   #function to turn off the device
   #try again

not within a loop since I want to just run it once and keep going, is this possible in python without using a loop?

Could you write a function to check if the connection work and run it before you try to run your current function? — Challe
– Challe, Commented Oct 17, 2020 at 18:52
Why not within a loop? Do you only want to try twice maximum? — tdelaney
– tdelaney, Commented Oct 17, 2020 at 18:54
There is, but the function will work to check the connection, since the device is alive, but when you try to poll data from the device it will give a byte mismatch, the only fix is to restart the device and try again. — Victor J Mytre
– Victor J Mytre, Commented Oct 17, 2020 at 18:55
I guess what's confusing is that you say you only want to run it once, but there is this "try again" comment. Which is it? — tdelaney
– tdelaney, Commented Oct 17, 2020 at 18:58

Ofek Hod · Accepted Answer · 2020-10-17 19:06:09Z

2

Instead of using a loop, since you explicitly want to use this logic maximum twice and be exception safe, just wrap everything into a function which returns the success status and call it twice:

def connect_and_do_stuff_safe() -> bool:
    try
       # function
       return True
    except
       # function to turn off the device
       return False

if not connect_and_do_stuff_safe():
    # Maybe you need to do some start related logic in between, anyway you need it here
    connect_and_do_stuff_safe()

answered Oct 17, 2020 at 19:06

Ofek Hod

4,0842 gold badges20 silver badges32 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Try in python, repeat if error but not inside a loop?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related