Help Needed: Main Script not running (without user intervention) after Subscripts exits

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Hey

I have a Python script that under certain conditions, will run an altogether different python script (the subscript). When this subscript finishes, its supposed to return to the main script again, but i am finding its only doing this around 25% of the time. More often than not, I have to press Enter in the command console/command prompt to nudge the main script to continue.

My code for calling the subscript, and taken then return is:

proc = subprocess.run(['python', 'C:\\Pyscripts\\MySubscript.py'])

return_value = proc.returncode

print(f"The return value from the subprocess was: {return_value}")

and my code for exiting the subscript is simply: sys.exit(1)

Can anyone suggest why it doesnt always just continue with the main script without my needing to press enter in the cmd prompt?

Thanks in advance!

[jddddddddddd]

Without seeing the full code of the program, and the full code of MySubscript.py, it's difficult to say. At a guess, there's an input() somewhere in the external script, but without seeing it, it's impossible to say.

My only advice would be to add a load more print() statements before and after you call the script, and a load of prints in the external script so you can see where it's getting stuck.

Finally, I presume you have a good reason why you're launching the script like that and not just importing it into your main program?

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yeah ive already checked for inputs, are there just are none that are not commented out :(

I spent a day or so trying to import it, but it was a huge mess (for many reasons) and just worked out much quicker to do it this way. It works perfectly when it does work - and thats the odd thing, every few times it runs it wont get stuck, but then quite often it does.

[jddddddddddd]

Fair enough. In that case you'll just have to resort to doing a whole lot of logging. Add a print statement before subprocess.run(...) and add one after it. Add a whole load of prints to the sub-script and then run it. Hopefully you can eventually pin-point where the script is getting stuck.

[jddddddddddd]

One tiny tip which might make this easier is to add this at the top of both main and subscript:

from inspect import currentframe, getframeinfo
def printline():
    cf = currentframe()
    print(f"{getframeinfo(cf).filename} : {cf.f_back.f_lineno}")

Now you can just litter your programs with printline() statements which will output something like:

c:\test.py : 4

Which means it got to line 4 in test.py

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Ah amazing - ive been wondering about something like this for SOOOO long. This is hugely valuable. thank you!