restart interactive interpreter?

lsloan117

How does one restart the Python interpreter in the interactive panel?

I tried sys.exit(), which I thought would make a new one start once the current one had exited. However, it just printed "EXIT (0)" and continued running.

ccc

Shutting down Pythonista:<br>
http://omz-software.com/pythonista/forums/discussion/888/quit-the-script/p1

Keeping your Pythonista script from going to sleep:<br>
http://omz-software.com/pythonista/forums/discussion/comment/1293#Comment_1293

lsloan117

Thanks for the suggestion. It may help, but it's still rather hack-ish. I wish @omz would change Pythonista to let the Python interpreter exit as it normally would, either from a crash, a call for sys.exit(), or other appropriate method call. Then Pythonista could either start a new interpreter automatically or prompt the user to tap a button to start one.

lsloan117

So, just to follow-up...

Through some experimentation with os.getpid(), I learned that the interactive interpreter and all of my programs are running from the same process. I was surprised by this because I expected a new interpreter to start each time a program is run and it would terminate when the program does. Apparently, the way @omz implemented Pythonista, the Python interpreter isn't a subprocess, it's part of the main one and it's reset whenever a program is run. That same interpreter (or a parallel one?) handles the interactive prompt, but there's no way to reset it.

It also appears that sys.exit() is trapped to print that EXIT (0) message. IMHO, I think the trap should reset the interpreter, if not start a new one.

omz

@lsloan I'd love to run the interpreter in a sub-process, but that's not possible on iOS (Apple's policy).

lsloan117

I understand, @omz. You need to play by their rules.

Could you describe what Pythonista does whenever a program is run? It seems to clear the environment first, because variables don't retain their values from one run to the next. If calls to sys.exit() are trapped, could it also clear the environment then?