subprocess.run parameters not fully documented

https://docs.python.org/3/library/subprocess.html#subprocess.run

So I want to capture STDERR, but it doesn't actually say how to do that anywhere that I can see. Note that I don't want to capture STDOUT.

My IDE is telling me that stderr accepts None and Int types. What are the int values? I'm guessing a PIPE:

subprocess.PIPE
Special value that can be used as the stdin, stdout or stderr argument to Popen and indicates that a pipe to the standard stream should be opened.

Now the user also needs to understand the inner workings of Popen? Why on earth does a user need to join so many dots just to use an arguement? Is not explicit is better than implicit part of the python ethos?

I'm sorry to be blunt, but none of this is well documented. There should be a comprehensive, itemised list of all parameters. Each one should explicitly list what they do and what their possible values are. As it is, it's a confused mess of "if x, then y in module q, but not z in module p".

Commencez par la documentation de subprocess.run liée dans l’issue et comparez ses descriptions de paramètres avec la documentation de Popen référencée, en particulier stderr et subprocess.PIPE. Le travail est considéré comme terminé lorsque les paramètres et les valeurs acceptées sont documentés assez clairement pour expliquer la capture de STDERR sans obliger les lecteurs à déduire le comportement à partir d’une autre API.