[mpich-discuss] Running on Cluster issue

Hi, I am trying to run a python code on cluster with Mpiexec using the command mpiexec -n 5 python parallel_simulation.py. This is supposed to run on 5 processes (that is what happening on local machine). But on cluster it keeps running it with 1 process. I have tried mpi4py but apparently it has conflict. I was wondering if you have any idea how to fix this. Many thanks in advance.