Passing arguments to "executable" parameter of the subprocess.Popen() call

Question

The subprocess.Popen() lets you pass the shell of your choice via the "executable" parameter.
I have chosen to pass "/bin/tcsh", and I do not want the tcsh to read my ~/.cshrc.
The tcsh manual says that I need to pass -f to /bin/tcsh to do that.

How do I ask Popen to execute /bin/tcsh with a -f option?

import subprocess

cmd = ["echo hi"]
print cmd

proc = subprocess.Popen(cmd, shell=False,  executable="/bin/tcsh", stderr=subprocess.PIPE, stdout=subprocess.PIPE)
return_code = proc.wait()

for line in proc.stdout:
    print("stdout: " + line.rstrip())

for line in proc.stderr:
    print("stderr: " + line.rstrip())

print return_code

Answer 1

Make your life easier:

subprocess.Popen(['/bin/tcsh', '-f', '-c', 'echo hi'],
    shell=False, stderr=subprocess.PIPE, stdout=subprocess.PIPE)