Opening a process with Popen and getting the PID

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From the documentation at http://docs.python.org/library/subprocess.html:

Popen.pid The process ID of the child process.

Note that if you set the shell argument to True, this is the process
ID of the spawned shell.

If shell is false, it should behave as you expect, I think.

If you were relying on shell being True for resolving executable paths using the PATH environment variable, you can accomplish the same thing using shutil.which instead, then pass the absolute path to Popen instead. (As an aside, if you are using Python 3.5 or newer, you should be using subprocess.run rather than Popen.

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