Execution is always as a shell

[KotlinIsland]

When there is no space in the command

subprocess.run(["a"])

Will not use the shell, but with:

subprocess_tee.run(["a"])

will be run as a shell.

I think it would be fairly simple to update the functionality to use create_subprocess_shell if a string is passed, and create_subprocess_exec if a iterable is passed.

[ssbarnea]

This was not really by accident, it was more of by design. Still, I would not refuse a change that makes it behave more like subprocess.run, where you can also specify shell as true or not.

[bmccutchon]

Would you accept a change that makes shell=False by default? shell=True really shouldn't be the default, since it's dangerous.