how to run shell commands inside docker container?

Question

import docker

# Initialize the Docker client
client = docker.from_env()

# Define Docker run options
docker_run_options = {
    'name': 'container-name',
    'user': 'dafoamuser',
    'mounts': [
        {
            'type': 'bind',
            'source': 'D:/Dafoam/oneraM6',
            'target': '/home/dafoamuser/mount'
        }
    ],
    'working_dir': '/home/dafoamuser/mount',
    'detach': True,
    'tty': True,
    'stdin_open': True,
    'command': 'bash'
}

# Run the Docker container with specified options
container = client.containers.run(
    'dafoamimage:latest',
    **docker_run_options
)

# Execute the mpirun command inside the container
mpirun_command = 'mpirun -np 8 python runScript_v2.py 2>&1 | tee logOpt.txt'
exec_cmd = container.exec_run(mpirun_command, tty=True, privileged=True)
print(f"Command: {mpirun_command}\nOutput:\n{exec_cmd.output.decode('utf-8')}")

# Stop and remove the container (if needed)
container.stop()
container.remove()

I am trying to execute a python script named runScript_v2.py inside container's shell using the above python script. But I get the following error:

C:\Users\yesbo\.conda\envs\py39env\lib\site-packages\paramiko\transport.py:219: CryptographyDeprecationWarning: Blowfish has been deprecated
  "class": algorithms.Blowfish,
Command: mpirun -np 8 python runScript_v2.py 2>&1 | tee logOpt.txt
Output:
--------------------------------------------------------------------------
mpirun was unable to find the specified executable file, and therefore
did not launch the job.  This error was first reported for process
rank 0; it may have occurred for other processes as well.

NOTE: A common cause for this error is misspelling a mpirun command
      line parameter option (remember that mpirun interprets the first
      unrecognized command line token as the executable).

Node:       c537205732b5
Executable: python
--------------------------------------------------------------------------
8 total processes failed to start

How can I fix this? From cmd I can run this mpirun command easily without any errors. But when I run my python script it gives me the error.