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pythonif-statement
Omik
Omik

Reputation: 13

Python Stopping a program at any point in an if command

I currently have a program that I am working on that requires the user to input some parameters, and then press a button to start the main part of the program.

After the start button is pressed, the if loop executes a sequential order of commands (around 20) and then stops.

I want to be able to stop this sequence of commands at any time during the code using a separate 'stop' button, but I am not sure how. I am more interested in a method of doing this than GUI syntax.

Any help is appreciated.

Example code:

if (start_button_is_pressed):
    #do thing a 
    #do thing b 
    #do thing c 
    ...
    #do thing z

# i want to be able to stop from any point a-z

Upvotes: 1

Views: 700

Answers (3)

addUsername
addUsername

Reputation: 193

You could use multiprocessing.Process to terminate() the process/function my_process_function() whenever you please... Run it as script to get outputs.

import multiprocessing

def my_process_function():
    for i in range (100):
        print(i)
        time.sleep(1)
    print("my_process end")

if __name__ == "__main__":
    x = multiprocessing.Process(target=my_process_function())
    x.start()

    print("Stop thread?")
    a=input()
    if (a=="y"):
        x.terminate()

Upvotes: 0

opensaucerer
opensaucerer

Reputation: 71

you can use a break statement inside the loop. Set an event such that when the stop button is pressed, it triggers a certain value and this value alters the loop. Sample process below

stop = False

if stop_button_is_pressed:
    stop = True

for a in b:
    if stop == True:
        break
    print(a)

print("Stopped")

Upvotes: 0

RufusVS
RufusVS

Reputation: 4127

You can use a loop and break execution at any point. If you want only a single pass through the steps, add a final break at the end.

jump_out = False
while not jump_out:
   step_1()
   if (jump_out): 
       break
   step_2()
   if (jump_out): 
       break
   # and so on
   step_n()
   break  # add unconditional break for single-pass execution

Upvotes: 1

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