/usr/lib/python2.7/dist-packages/mpi4py/mpi.cfg is in python-mpi4py 2.0.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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[mpi] mpicc = /usr/bin/mpicc mpicxx = /usr/bin/mpicxx