doc pages for new Python function wrappers

examples/python/log.1May25.python.wrap.g++.1

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+LAMMPS (2 Apr 2025 - Development - patch_2Apr2025-125-g7ca493917a-modified)
+# 3d Lennard-Jones melt with equal- and atom-style variables which
+#   use a Python function wrapper in their formulas
+
+variable        x index 5
+variable        y index 5
+variable        z index 5
+
+units           lj
+atom_style      atomic
+
+lattice         fcc 0.8442
+Lattice spacing in x,y,z = 1.6795962 1.6795962 1.6795962
+region          box block 0 $x 0 $y 0 $z
+region          box block 0 5 0 $y 0 $z
+region          box block 0 5 0 5 0 $z
+region          box block 0 5 0 5 0 5
+create_box      1 box
+Created orthogonal box = (0 0 0) to (8.397981 8.397981 8.397981)
+  1 by 1 by 1 MPI processor grid
+create_atoms    1 box
+Created 500 atoms
+  using lattice units in orthogonal box = (0 0 0) to (8.397981 8.397981 8.397981)
+  create_atoms CPU = 0.000 seconds
+mass            1 1.0
+
+velocity        all create 1.44 87287 loop geom
+
+pair_style      lj/cut 2.5
+pair_coeff      1 1 1.0 1.0 2.5
+
+neighbor        0.3 bin
+neigh_modify    delay 0 every 20 check no
+
+fix             1 all nve
+
+variable        foo python truncate
+python          truncate return v_foo input 1 v_pyarg1 format fi here """
+def truncate(x):
+  return int(x)
+"""
+variable        pyarg1 internal 0.0
+
+variable        scalar equal py_foo(4.5)
+print           "TRUNCATE ${scalar}"
+TRUNCATE 4
+
+variable        xtrunc atom py_foo(x)
+variable        ytrunc atom py_foo(y)
+variable        ztrunc atom py_foo(z)
+
+#dump            1 all custom 100 tmp.dump id x y z
+dump            1 all custom 100 tmp.dump id x y z v_xtrunc v_ytrunc v_ztrunc
+
+run             100
+Generated 0 of 0 mixed pair_coeff terms from geometric mixing rule
+Neighbor list info ...
+  update: every = 20 steps, delay = 0 steps, check = no
+  max neighbors/atom: 2000, page size: 100000
+  master list distance cutoff = 2.8
+  ghost atom cutoff = 2.8
+  binsize = 1.4, bins = 6 6 6
+  1 neighbor lists, perpetual/occasional/extra = 1 0 0
+  (1) pair lj/cut, perpetual
+      attributes: half, newton on
+      pair build: half/bin/atomonly/newton
+      stencil: half/bin/3d
+      bin: standard
+Per MPI rank memory allocation (min/avg/max) = 2.644 | 2.644 | 2.644 Mbytes
+   Step          Temp          E_pair         E_mol          TotEng         Press     
+         0   1.44          -6.7733681      0             -4.6176881     -5.0221006    
+       100   0.75627408    -5.7580082      0             -4.6258659      0.21870071   
+Loop time of 0.0160255 on 1 procs for 100 steps with 500 atoms
+
+Performance: 2695709.610 tau/day, 6240.069 timesteps/s, 3.120 Matom-step/s
+100.0% CPU use with 1 MPI tasks x no OpenMP threads
+
+MPI task timing breakdown:
+Section |  min time  |  avg time  |  max time  |%varavg| %total
+---------------------------------------------------------------
+Pair    | 0.011326   | 0.011326   | 0.011326   |   0.0 | 70.67
+Neigh   | 0.002924   | 0.002924   | 0.002924   |   0.0 | 18.25
+Comm    | 0.00046255 | 0.00046255 | 0.00046255 |   0.0 |  2.89
+Output  | 0.0010398  | 0.0010398  | 0.0010398  |   0.0 |  6.49
+Modify  | 0.00020589 | 0.00020589 | 0.00020589 |   0.0 |  1.28
+Other   |            | 6.725e-05  |            |       |  0.42
+
+Nlocal:            500 ave         500 max         500 min
+Histogram: 1 0 0 0 0 0 0 0 0 0
+Nghost:           1941 ave        1941 max        1941 min
+Histogram: 1 0 0 0 0 0 0 0 0 0
+Neighs:          18766 ave       18766 max       18766 min
+Histogram: 1 0 0 0 0 0 0 0 0 0
+
+Total # of neighbors = 18766
+Ave neighs/atom = 37.532
+Neighbor list builds = 5
+Dangerous builds not checked
+Total wall time: 0:00:00