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".

Comienza por la documentación de subprocess.run enlazada en el issue y compara sus descripciones de parámetros con la documentación de Popen referenciada, especialmente stderr y subprocess.PIPE. Se considera terminado cuando los parámetros y los valores aceptados están documentados con suficiente claridad para explicar cómo capturar STDERR sin que los lectores tengan que inferir el comportamiento a partir de otra API.