# 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.