[Python] Is there a reason why paramiko.SSHClient -> exec_command cannot find an executable...

I'm creating a python (3.13.5) program on my pc that connects to our mainframe and runs a python (3.12.8) program from our z/os uss environment.

I can successfully connect using this code here:

remote_script_path = '/u/h39808'
script = 'helloworld.py'
try:
with paramiko.SSHClient() as client:
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(host_address,
username=username_entry.get(),
password=passowrd_entry.get())


And when I use the following invoke_shell method to run my python program remotely, it does so fine:

shell = client.invoke_shell()
shell.send(f"python {remote_script_path}/{script}\n")


But since all I am doing is executing one program at any time and waiting for a response, I'd like to do this with exec_command; problem is, when I use the following:

**stdin, stdout, stderr = client.exec_command(f"python {remote_script_path}/{script}")
print(stderr.read().decode())**


It returns - python: FSUM7351 not found

And let's say I try using a command to go to the remote path and list the contents:

stdin, stdout, stderr = client.exec_command(f"cd {remote_script_path}; ls -l")


This comes back, which is what I am expecting: -rwxrwxr-x 1 BPXROOT 99999999 59 Jun 24 14:28 helloworld.py

Could this be due to a security restriction, or something else off with our uss environment, or is it my code that is to blame?

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