Add example showing Python exception handling

doc/src/Python_error.rst

@@ -7,6 +7,27 @@ current Python process with an error message.  C++ exceptions allow capturing
 them on the C++ side and rethrowing them on the Python side. This way
 LAMMPS errors can be handled through the Python exception handling mechanism.
 
+.. code-block:: Python
+
+   from lammps import lammps, MPIAbortException
+
+   lmp = lammps()
+
+   try:
+      # LAMMPS will normally terminate itself and the running process if an error
+      # occurs. This would kill the Python interpreter. To avoid this, make sure to
+      # compile with LAMMPS_EXCEPTIONS enabled. This ensures the library API calls
+      # will not terminate the parent process. Instead, the library wrapper will
+      # detect that an error has occured and throw a Python exception
+
+      lmp.command('unknown')
+   except MPIAbortException as ae:
+      # Single MPI process got killed. This would normally be handled by an MPI abort
+      pass
+   except Exception as e:
+      # All (MPI) processes have reached this error
+      pass
+
 .. warning::
 
    Capturing a LAMMPS exception in Python can still mean that the