python: fix test_python with python2.7

examples/python/coins_grid.py

@@ -51,6 +51,7 @@
   http://www.hakank.org/google_or_tools/
 """
 
+from __future__ import print_function
 import sys
 from ortools.constraint_solver import pywrapcp
 

examples/python/coins_grid_mip.py

@@ -40,11 +40,10 @@
   http://www.hakank.org/google_or_tools/
 """
 
+from __future__ import print_function
 from ortools.linear_solver import pywraplp
 
-
 def main(unused_argv):
-
   # Create the solver.
 
   # using CBC
@@ -97,6 +96,5 @@ def main(unused_argv):
   print('walltime  :', solver.WallTime(), 'ms')
   # print 'iterations:', solver.Iterations()
 
-
 if __name__ == '__main__':
   main('coin grids')

examples/python/killer_sudoku.py

@@ -67,8 +67,8 @@
   http://www.hakank.org/google_or_tools/
 """
 
+from __future__ import print_function
 import sys
-
 from ortools.constraint_solver import pywrapcp
 
 #

examples/python/vendor_scheduling.py

@@ -1,15 +1,13 @@
+from __future__ import print_function
 from ortools.constraint_solver import pywrapcp
 
-
 def main():
-
   # Create the solver.
   solver = pywrapcp.Solver('Vendors scheduling')
 
   #
   # data
   #
-
   num_vendors = 9
   num_hours = 10
   num_work_types = 1
@@ -96,6 +94,5 @@ def main():
   print('branches:', solver.Branches())
   print('WallTime:', solver.WallTime(), 'ms')
 
-
 if __name__ == '__main__':
   main()