in.simple-001.py
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	#!/usr/bin/env python -i

	from __future__ import print_function

	infile = 'in.simple'
	me = 0

	from lammps import lammps
	lmp = lammps()

	# run infile one line at a time

	lines = open(infile,'r').readlines()
	for line in lines: lmp.command(line)

	lmp.command("run 10")
	x = lmp.gather_atoms("x",1,3)
	epsilon = 0.1
	x[0] += epsilon
	lmp.scatter_atoms("x",1,3,x)
	lmp.command("run 1");

	f = lmp.extract_atom("f",3)
	print ("Force on 1 atom via extract_atom: ",f[0][0])

	fx = lmp.extract_variable("fx","all",1)
	print ("Force on 1 atom via extract_variable:",fx[0])