You need to understand that the break statement in your example will exit the infinite loop you've created with while True. So when the break condition is True, the program will quit the infinite loop and continue to the next indented block. Since there is no following block in your code, the function ends and don't return anything.

May 21, 2013 · The problem is, even though you set x=1 when a+b+c==1000, you do not break out of the two for loops when that condition is met, and so the while loop doesn't know that x==1 until both for loops finish. To avoid this problem, you can add explicit break statements to the for loops (and as Sukrit Kalra points out, the while loop becomes unnecessary).

Sep 25, 2013 · From here, while the program is in the forever loop spamming away requests for data from my broker's API, using the CTRL-C keyboard interrupt function toggles the exception to the try loop, which nullifies the while loop, allowing the script to finalize the data saving protocol without bringing the entire script to an abrupt halt. Hope this helps!

Nov 1, 2012 · I am reading serial data and writing to a csv file using a while loop. I want the user to be able to kill the while loop once they feel they have collected enough data. while True: #do a bunch of serial stuff #if the user presses the 'esc' or 'return' key: break

Good point about about putting the timeout check in the while loop condition. As for the comment about time.sleep(), the code does no work so will be cycling through the loop as fast as it can go. By adding a short time.sleep() the CPU can go idle …

Jun 26, 2014 · Then, at the moment an iteration is finished, if an exception is pending I would break the loop and re-raise the exception (to let normal exception handling a chance to happen). This works (tested with Python 2.7): x = 1 print "Script started."

Jan 18, 2023 · Opening and closing a file repeatedly in a loop isn't optimized and may reduce the performance of your program. As you say if you want to don't lose the data while writing in a file cause of crash probability, you can use the flush() method in Python.

Aug 22, 2017 · Because of the attention, this post is attracting I thought it would be good to point out how this can be achieved with an infinite while loop as well. To use an infinite loop with tqdm you need to change your while loop into an infinite for loop by utilizing a generator. Infinite loop (no progress bar) while True: # Do stuff here

.close() can be used by different event loop implementations to free up system resources allocated by the loop (or do anything else). If you'll take a look at the code of _UnixSelectorEventLoop , which is the (default) IOLoop used in …

Oct 3, 2015 · It is the infinitive python loop in a separate thread with the safe signal ending. Also has thread-blocking sleep step - up to you to keep it, replace for asyncio implementation or remove. This function could be imported to any place in an application, runs without blocking other code (e.g. good for REDIS pusub subscription).