[Python] After starting process, how to get parent's PID in the child?

In Python, I start a new process via Popen(), which works fine. Now in the child process I want to find the parent's process ID.

What is the best way to achieve this, maybe I can pass the PID via the Popen constructor, but how? Or is there a better way to do so?

PS: If possible I would prefere a solution using only standard libraries.

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