ImportError: No module named mpi4py

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I am brand new to parallel computing and I'm trying to set up a small cluster of Raspberry Pi's to fiddle around with. Whenever I went to install mpi4py, I used pip3 install mpi4py but I am still getting the following error when I try to run a simple test script. I am able to use mpiexec with a Hello World script that prints "Hello" for every core in the cluster.

Hardware is a cluster Raspberry Pi 3B+ running Rasbian Lite

test.py:

from mpi4py import MPI

print("Test")

This is the readout that I am getting from the command line:

Traceback (most recent call last):
  File "test.py", line 1, in <module>
    from mpi4py import MPI
ImportError: No module named mpi4py

Thanks in advance



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