restore pylammps.py

python/lammps/pylammps.py

@@ -16,6 +16,10 @@
 # Written by Richard Berger <richard.berger@outlook.com>
 ################################################################################
 
+# for python2/3 compatibility
+
+from __future__ import print_function
+
 import io
 import os
 import re
@@ -758,7 +762,7 @@ class PyLammps(object):
     if self.comm_me > 0:
       raise Exception("PyLammps.eval() may only be used on MPI rank 0")
 
-    value = print('"$(%s)"' % expr).strip()
+    value = self.lmp_print('"$(%s)"' % expr).strip()
     try:
       return float(value)
     except ValueError:
@@ -843,6 +847,10 @@ class PyLammps(object):
       elements.append(element)
     return elements
 
+  def lmp_print(self, s):
+    """ needed for Python2 compatibility, since print is a reserved keyword """
+    return self.__getattr__("print")(s)
+
   def __dir__(self):
     return sorted(set(['angle_coeff', 'angle_style', 'atom_modify', 'atom_style', 'atom_style',
     'bond_coeff', 'bond_style', 'boundary', 'change_box', 'communicate', 'compute',