Update tutorial_pylammps.txt

Step 1: Building LAMMPS as a shared library :h4

To use LAMMPS inside of Python it has to be compiled as shared library. This

library is then loaded by the Python interface. In this example, we use the

Make.py utility to create a Makefile with C++ exceptions, PNG, JPEG and FFMPEG

output support enabled. Finally, we also enable the MOLECULE package and compile

using the generated {auto} Makefile.

library is then loaded by the Python interface. In this example we enable the

MOLECULE package and compile LAMMPS with C++ exceptions, PNG, JPEG and FFMPEG

output support enabled.

cd $LAMMPS_DIR/src :pre

# generate custom Makefile

python Make.py -jpg -png -s ffmpeg exceptions -m mpi -a file :pre

# add packages if necessary

make yes-MOLECULE :pre

# compile shared library using Makefile

make mode=shlib auto :pre

make mpi mode=shlib LMP_INC="-DLAMMPS_PNG -DLAMMPS_JPEG -DLAMMPS_FFMPEG -DLAMMPS_EXCEPTIONS" JPG_LIB="-lpng" :pre

Step 2: Installing the LAMMPS Python package :h4