# Extending the Python interface

As noted previously, most of the
`lammps <lammps.lammps>`{.interpreted-text role="py:class"}\_\_ Python
class methods correspond one-to-one with the functions in the LAMMPS
library interface in `src/library.cpp` and `library.h`. This means you
can extend the Python wrapper by following these steps:

-   Add a new interface function to `src/library.cpp` and
    `src/library.h`.
-   Rebuild LAMMPS as a shared library.
-   Add a wrapper method to `python/lammps/core.py` for this interface
    function.
-   Define the corresponding `argtypes` list and `restype` in the
    `lammps.__init__()` function.
-   Re-install the shared library and the python module, if needed
-   You should now be able to invoke the new interface function from a
    Python script.