Process substitution not allowed by Python's subprocess with shell=True?

Question

Here is a toy example of process substitution that works fine in Bash:

$ wc -l <(pwd)
1 /proc/self/fd/11

So why does the same command gi

Answer 1

/bin/sh: 1: Syntax error: "(" unexpected

You have a bashism. It is not valid according to POSIX, which is what /bin/sh implements.