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How to run a new simulation
===========================
After installing WarpX as a Python package (see the section
:doc:`../installation`), you can use its functionalities in a Python script
to run a simulation.
In order to run a new simulation:
* Create a **new directory**, where the simulation will be run.
* Add a **Python script** in the directory.
This file contains the numerical and physical parameters that define
the situation to be simulated.
Example input files can be found in the section :doc:`examples`.
* **Run** the script with Python:
::
mpirun -np <n_ranks> python <python_script>
where ``<n_ranks>`` is the number of MPI ranks used, and ``<python_script>``
is the name of the script.
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