timeout - Python script executes another script and resumes after second script completes its job -

is there way check if subprocess has finished job? python script executes 123.exe cmd. 123.exe things , in end writes 1 or 0 txt file. python script reads txt file , continues job if '1' , stops if '0'. @ moment can think of, put python script sleep minute. way 123.exe has written 1 or 0 txt file. realization simple @ same time stupid.

so question is, there way deal problem without need timeout? way make python script wait til 123.exe stops?

use:

retcode = subprocess.call(["123.exe"]) 

this execute command, wait until finishes, , return code retcode (this way avoid need of checking output status file, if command returns proper return code).

if need instantiate manually subprocess.popen, go for

popen.wait() 

(and check popen.returncode).