diff --git a/SConstruct b/SConstruct
index 754b27f27..dae4b2d0d 100644
--- a/SConstruct
+++ b/SConstruct
@@ -37,11 +37,12 @@ Basic usage:
     'scons doxygen' - Build the Doxygen documentation
 """
 
+from __future__ import print_function
 from buildutils import *
 
 if not COMMAND_LINE_TARGETS:
     # Print usage help
-    print __doc__
+    print(__doc__)
     sys.exit(0)
 
 valid_commands = ('build','clean','install','uninstall',
@@ -49,7 +50,7 @@ valid_commands = ('build','clean','install','uninstall',
 
 for command in COMMAND_LINE_TARGETS:
     if command not in valid_commands and not command.startswith('test'):
-        print 'ERROR: unrecognized command line target: %r' % command
+        print('ERROR: unrecognized command line target: %r' % command)
         sys.exit(0)
 
 extraEnvArgs = {}
@@ -100,7 +101,7 @@ if 'clean' in COMMAND_LINE_TARGETS:
         if name.startswith('ctmethods.'):
             removeFile('interfaces/matlab/toolbox/' + name)
 
-    print 'Done removing output files.'
+    print('Done removing output files.')
 
     if COMMAND_LINE_TARGETS == ['clean']:
         # Just exit if there's nothing else to do
@@ -112,7 +113,7 @@ if 'clean' in COMMAND_LINE_TARGETS:
 # *** Set system-dependent defaults for some options ***
 # ******************************************************
 
-print 'INFO: SCons is using the following Python interpreter:', sys.executable
+print('INFO: SCons is using the following Python interpreter:', sys.executable)
 
 opts = Variables('cantera.conf')
 
@@ -162,8 +163,8 @@ if os.name == 'nt':
         toolchain = ['default']
         if pickCompilerEnv['msvc_version']:
             extraEnvArgs['MSVC_VERSION'] = pickCompilerEnv['msvc_version']
-        print 'INFO: Compiling with MSVC', (pickCompilerEnv['msvc_version'] or
-                                            pickCompilerEnv['MSVC_VERSION'])
+        print('INFO: Compiling with MSVC', (pickCompilerEnv['msvc_version'] or
+                                            pickCompilerEnv['MSVC_VERSION']))
 
     elif pickCompilerEnv['toolchain'] == 'mingw':
         toolchain = ['mingw', 'f90']
@@ -175,8 +176,8 @@ if os.name == 'nt':
         toolchain = ['intelc'] # note: untested
 
     extraEnvArgs['TARGET_ARCH'] = pickCompilerEnv['target_arch']
-    print 'INFO: Compiling for architecture:', pickCompilerEnv['target_arch']
-    print 'INFO: Compiling using the following toolchain(s):', repr(toolchain)
+    print('INFO: Compiling for architecture:', pickCompilerEnv['target_arch'])
+    print('INFO: Compiling using the following toolchain(s):', repr(toolchain))
 
 else:
     toolchain = ['default']
@@ -205,7 +206,7 @@ if 'HOME' in os.environ:
 
 # Fix an issue with Unicode sneaking into the environment on Windows
 if os.name == 'nt':
-    for key,val in env['ENV'].iteritems():
+    for key,val in env['ENV'].items():
         env['ENV'][key] = str(val)
 
 if 'FRAMEWORKS' not in env:
@@ -224,7 +225,7 @@ elif os.name == 'nt':
     defaults.boostIncDir = ''
     env['INSTALL_MANPAGES'] = False
 else:
-    print "Error: Unrecognized operating system '%s'" % os.name
+    print("Error: Unrecognized operating system '%s'" % os.name)
     sys.exit(1)
 
 compiler_options = [
@@ -286,7 +287,7 @@ elif 'clang' in env.subst('$CC'):
     env['pch_flags'] = ['-include-pch', 'src/pch/system.h.gch']
 
 else:
-    print "WARNING: Unrecognized C compiler '%s'" % env['CC']
+    print("WARNING: Unrecognized C compiler '%s'" % env['CC'])
 
 if env['OS'] in ('Windows', 'Darwin'):
     defaults.threadFlags = ''
@@ -630,7 +631,7 @@ opts.Save('cantera.conf', env)
 
 if 'help' in COMMAND_LINE_TARGETS:
     ### Print help about configuration options and exit.
-    print """
+    print("""
         **************************************************
         *   Configuration options for building Cantera   *
         **************************************************
@@ -649,10 +650,10 @@ running 'scons build'. The format of this file is:
     option2 = 'value2'
 
         **************************************************
-"""
+""")
 
     for opt in opts.options:
-        print '\n'.join(formatOption(env, opt))
+        print('\n'.join(formatOption(env, opt)))
     sys.exit(0)
 
 if 'doxygen' in COMMAND_LINE_TARGETS:
@@ -665,7 +666,7 @@ valid_arguments = (set(opt[0] for opt in windows_compiler_options) |
                    set(opt[0] for opt in config_options))
 for arg in ARGUMENTS:
     if arg not in valid_arguments:
-        print 'Encountered unexpected command line argument: %r' % arg
+        print('Encountered unexpected command line argument: %r' % arg)
         sys.exit(1)
 
 # Require a StrictVersion-compatible version
@@ -681,10 +682,10 @@ except OSError:
     env['git_commit'] = '<unknown>'
 
 # Print values of all build options:
-print "Configuration variables read from 'cantera.conf' and command line:"
+print("Configuration variables read from 'cantera.conf' and command line:")
 for line in open('cantera.conf'):
-    print '   ', line.strip()
-print
+    print('   ', line.strip())
+print()
 
 # ********************************************
 # *** Configure system-specific properties ***
@@ -703,10 +704,10 @@ elif env['env_vars']:
             else:
                 env['ENV'][name] = os.environ[name]
             if env['VERBOSE']:
-                print 'Propagating environment variable {0}={1}'.format(name, env['ENV'][name])
+                print('Propagating environment variable {0}={1}'.format(name, env['ENV'][name]))
         elif name not in defaults.env_vars.split(','):
-            print 'WARNING: failed to propagate environment variable', repr(name)
-            print '         Edit cantera.conf or the build command line to fix this.'
+            print('WARNING: failed to propagate environment variable', repr(name))
+            print('         Edit cantera.conf or the build command line to fix this.')
 
 env['extra_inc_dirs'] = [d for d in env['extra_inc_dirs'].split(':') if d]
 env['extra_lib_dirs'] = [d for d in env['extra_lib_dirs'].split(':') if d]
@@ -793,20 +794,20 @@ if env['coverage']:
         env.Append(LINKFLAGS=['-fprofile-arcs', '-ftest-coverage'])
 
     else:
-        print 'Error: coverage testing is only available with GCC.'
+        print('Error: coverage testing is only available with GCC.')
         exit(0)
 
 if env['toolchain'] == 'mingw':
     env.Append(LINKFLAGS=['-static-libgcc', '-static-libstdc++'])
 
 def config_error(message):
-    print 'ERROR:', message
+    print('ERROR:', message)
     if env['VERBOSE']:
-        print '*' * 25, 'Contents of config.log:', '*' * 25
-        print open('config.log').read()
-        print '*' * 28, 'End of config.log', '*' * 28
+        print('*' * 25, 'Contents of config.log:', '*' * 25)
+        print(open('config.log').read())
+        print('*' * 28, 'End of config.log', '*' * 28)
     else:
-        print "See 'config.log' for details."
+        print("See 'config.log' for details.")
     sys.exit(1)
 
 # First, a sanity check:
@@ -818,7 +819,7 @@ if not conf.CheckCXXHeader('cmath', '<>'):
 if env['system_fmt'] in ('y', 'default'):
     if conf.CheckCXXHeader('fmt/ostream.h', '""'):
         env['system_fmt'] = True
-        print """INFO: Using system installation of fmt library."""
+        print("""INFO: Using system installation of fmt library.""")
 
     elif env['system_fmt'] == 'y':
         config_error('Expected system installation of fmt library, but it '
@@ -826,7 +827,7 @@ if env['system_fmt'] in ('y', 'default'):
 
 if env['system_fmt'] in ('n', 'default'):
     env['system_fmt'] = False
-    print """INFO: Using private installation of fmt library."""
+    print("""INFO: Using private installation of fmt library.""")
     if not os.path.exists('ext/fmt/fmt/ostream.h'):
         if not os.path.exists('.git'):
             config_error('fmt is missing. Install source in ext/fmt.')
@@ -909,7 +910,7 @@ env['HAS_LIBCPP'] = conf.CheckDeclaration('_LIBCPP_VERSION', '#include <iostream
 boost_version_source = get_expression_value(['<boost/version.hpp>'], 'BOOST_LIB_VERSION')
 retcode, boost_lib_version = conf.TryRun(boost_version_source, '.cpp')
 env['BOOST_LIB_VERSION'] = boost_lib_version.strip()
-print 'INFO: Found Boost version {0!r}'.format(env['BOOST_LIB_VERSION'])
+print('INFO: Found Boost version {0!r}'.format(env['BOOST_LIB_VERSION']))
 if not env['BOOST_LIB_VERSION']:
     config_error("Boost could not be found. Install Boost headers or set"
                  " 'boost_inc_dir' to point to the boost headers.")
@@ -970,9 +971,9 @@ if env['system_sundials'] == 'y':
     # Ignore the minor version, e.g. 2.4.x -> 2.4
     env['sundials_version'] = '.'.join(sundials_version.split('.')[:2])
     if env['sundials_version'] not in ('2.4','2.5','2.6','2.7'):
-        print """ERROR: Sundials version %r is not supported.""" % env['sundials_version']
+        print("""ERROR: Sundials version %r is not supported.""" % env['sundials_version'])
         sys.exit(1)
-    print """INFO: Using system installation of Sundials version %s.""" % sundials_version
+    print("""INFO: Using system installation of Sundials version %s.""" % sundials_version)
 
     #Determine whether or not Sundials was built with BLAS/LAPACK
     if LooseVersion(env['sundials_version']) < LooseVersion('2.6'):
@@ -991,10 +992,10 @@ if env['system_sundials'] == 'y':
     # In the case where a user is trying to link Cantera to an external BLAS/LAPACK
     # library, but Sundials was configured without this support, print a Warning.
     if not env['has_sundials_lapack'] and env['use_lapack']:
-        print ('WARNING: External BLAS/LAPACK has been specified for Cantera '
-               'but Sundials was built without this support.')
+        print('WARNING: External BLAS/LAPACK has been specified for Cantera '
+              'but Sundials was built without this support.')
 else: # env['system_sundials'] == 'n'
-    print """INFO: Using private installation of Sundials version 2.6."""
+    print("""INFO: Using private installation of Sundials version 2.6.""")
     env['sundials_version'] = '2.6'
     env['has_sundials_lapack'] = int(env['use_lapack'])
 
@@ -1012,11 +1013,11 @@ end program main
         if success and 'Hello, world!' in output:
             return True
         else:
-            print ("WARNING: Unable to use '%s' to compile the Fortran "
-                   "interface. See config.log for details." % compiler)
+            print("WARNING: Unable to use '%s' to compile the Fortran "
+                  "interface. See config.log for details." % compiler)
             return False
     elif expected:
-        print "ERROR: Couldn't find specified Fortran compiler: '%s'" % compiler
+        print("ERROR: Couldn't find specified Fortran compiler: '%s'" % compiler)
         sys.exit(1)
 
     return False
@@ -1034,16 +1035,16 @@ if env['f90_interface'] in ('y','default'):
         foundF90 = check_fortran(compiler)
 
     if foundF90:
-        print "INFO: Using '%s' to build the Fortran 90 interface" % env['FORTRAN']
+        print("INFO: Using '%s' to build the Fortran 90 interface" % env['FORTRAN'])
         env['f90_interface'] = 'y'
     else:
         if env['f90_interface'] == 'y':
-            print "ERROR: Couldn't find a suitable Fortran compiler to build the Fortran 90 interface."
+            print("ERROR: Couldn't find a suitable Fortran compiler to build the Fortran 90 interface.")
             sys.exit(1)
         else:
             env['f90_interface'] = 'n'
-	    env['FORTRAN'] = ''
-            print "INFO: Skipping compilation of the Fortran 90 interface."
+            env['FORTRAN'] = ''
+            print("INFO: Skipping compilation of the Fortran 90 interface.")
 
 if 'gfortran' in env['FORTRAN']:
     env['FORTRANMODDIRPREFIX'] = '-J'
@@ -1059,9 +1060,9 @@ env['FORTRANMODDIR'] = '${TARGET.dir}'
 env = conf.Finish()
 
 if env['VERBOSE']:
-    print '-------------------- begin config.log --------------------'
-    print open('config.log').read()
-    print '--------------------- end config.log ---------------------'
+    print('-------------------- begin config.log --------------------')
+    print(open('config.log').read())
+    print('--------------------- end config.log ---------------------')
 
 env['python_cmd_esc'] = quoted(env['python_cmd'])
 
@@ -1070,9 +1071,9 @@ cython_min_version = LooseVersion('0.23')
 numpy_min_test_version = LooseVersion('1.8.1')
 env['install_python2_action'] = ''
 if env['python_package'] == 'new':
-    print ("WARNING: The 'new' option for the Python package is "
-           "deprecated and will be removed in the future. Use "
-           "'full' instead.")
+    print("WARNING: The 'new' option for the Python package is "
+          "deprecated and will be removed in the future. Use "
+          "'full' instead.")
     env['python_package'] = 'full'  # Allow 'new' as a synonym for 'full'
 warn_no_python = False
 python_message = ''
@@ -1097,7 +1098,7 @@ if env['python_package'] in ('full', 'default'):
                                                                                   cython_min_version))
             warn_no_python = True
         else:
-            print 'INFO: Using Cython version {0}.'.format(cython_version)
+            print('INFO: Using Cython version {0}.'.format(cython_version))
 
     # Test to see if we can import the specified array module
     script = '\n'.join(("from __future__ import print_function",
@@ -1123,13 +1124,13 @@ if env['python_package'] in ('full', 'default'):
         info = getCommandOutput(env['python_cmd'], '-c', script)
     except OSError as err:
         if env['VERBOSE']:
-            print 'Error checking for Python 2:'
-            print err
+            print('Error checking for Python 2:')
+            print(err)
         warn_no_python = True
     except subprocess.CalledProcessError as err:
         if env['VERBOSE']:
-            print 'Error checking for Python 2:'
-            print err, err.output
+            print('Error checking for Python 2:')
+            print(err, err.output)
         warn_no_python = True
     else:
         (env['python_version'], numpy_version,
@@ -1139,30 +1140,30 @@ if env['python_package'] in ('full', 'default'):
             python_message += "NumPy for Python {0} not found.\n".format(env['python_version'])
             warn_no_python = True
         elif numpy_version < numpy_min_test_version:
-            print ("WARNING: The installed version of Numpy for Python {0} is not tested and "
-                   "support is not guaranteed. Found {1} but {2} or newer is preferred".format(
-                       env['python_version'], numpy_version, numpy_min_test_version))
+            print("WARNING: The installed version of Numpy for Python {0} is not tested and "
+                  "support is not guaranteed. Found {1} but {2} or newer is preferred".format(
+                      env['python_version'], numpy_version, numpy_min_test_version))
         else:
-            print 'INFO: Using NumPy version {0} for Python {1}.'.format(
-                numpy_version, env['python_version'])
+            print('INFO: Using NumPy version {0} for Python {1}.'.format(
+                numpy_version, env['python_version']))
 
     if warn_no_python:
         if env['python_package'] == 'default':
-            print ('WARNING: Not building the full Python 2 package because the Python '
-                   '2 interpreter %r could not be found or a required dependency '
-                   '(e.g. numpy) was not found.' % env['python_cmd'])
-            print python_message
+            print('WARNING: Not building the full Python 2 package because the Python '
+                  '2 interpreter %r could not be found or a required dependency '
+                  '(e.g. numpy) was not found.' % env['python_cmd'])
+            print(python_message)
 
             env['python_package'] = 'minimal'
         else:
-            print ('ERROR: Could not execute the Python 2 interpreter %r or a required '
-                   'dependency (e.g. numpy) could not be found.' %
-                   env['python_cmd'])
-            print python_message
+            print('ERROR: Could not execute the Python 2 interpreter %r or a required '
+                  'dependency (e.g. numpy) could not be found.' %
+                  env['python_cmd'])
+            print(python_message)
 
             sys.exit(1)
     else:
-        print 'INFO: Building the full Python package for Python {0}'.format(env['python_version'])
+        print('INFO: Building the full Python package for Python {0}'.format(env['python_version']))
         env['python_package'] = 'full'
 
     # Check for 3to2. See http://pypi.python.org/pypi/3to2
@@ -1184,15 +1185,15 @@ if env['python_package'] in ('full', 'default'):
                 ret = getCommandOutput('3to2', '-l')
         except (OSError, subprocess.CalledProcessError) as err:
             if env['VERBOSE']:
-                print 'Error checking for 3to2:'
-                print err
+                print('Error checking for 3to2:')
+                print(err)
             ret = ''
         if 'print' in ret:
             env['python_convert_examples'] = True
         else:
             env['python_convert_examples'] = False
-            print ("WARNING: Couldn't find the 3to2 package. "
-                   "Python 2 examples will not work correctly.")
+            print("WARNING: Couldn't find the 3to2 package. "
+                  "Python 2 examples will not work correctly.")
 
 else:
     env['python_module_loc'] = ''
@@ -1229,13 +1230,13 @@ if env['python3_package'] in ('y', 'default'):
         info = getCommandOutput(env['python3_cmd'], '-c', script)
     except OSError as err:
         if env['VERBOSE']:
-            print 'Error checking for Python 3:'
-            print err
+            print('Error checking for Python 3:')
+            print(err)
         warn_no_python3 = True
     except subprocess.CalledProcessError as err:
         if env['VERBOSE']:
-            print 'Error checking for Python 3:'
-            print err, err.output
+            print('Error checking for Python 3:')
+            print(err, err.output)
         warn_no_python3 = True
     else:
         (env['python3_version'], numpy3_version,
@@ -1245,28 +1246,28 @@ if env['python3_package'] in ('y', 'default'):
             python3_message += "NumPy for Python {0} not found.\n".format(env['python3_version'])
             warn_no_python3 = True
         elif numpy3_version < numpy_min_test_version:
-            print ("WARNING: The installed version of Numpy for Python {0} is not tested and "
-                   "support is not guaranteed. Found {1} but {2} or newer is preferred".format(
-                       env['python3_version'], numpy3_version, numpy_min_test_version))
+            print("WARNING: The installed version of Numpy for Python {0} is not tested and "
+                  "support is not guaranteed. Found {1} but {2} or newer is preferred".format(
+                      env['python3_version'], numpy3_version, numpy_min_test_version))
         else:
-            print 'INFO: Using NumPy version {0} for Python {1}.'.format(
-                numpy3_version, env['python3_version'])
+            print('INFO: Using NumPy version {0} for Python {1}.'.format(
+                numpy3_version, env['python3_version']))
 
     if warn_no_python3:
         if env['python3_package'] == 'default':
-            print ('INFO: Not building the Python 3 package because the Python '
-                   '3 interpreter %r could not be found or a required dependency '
-                   '(e.g. numpy) was not found.' % env['python3_cmd'])
-            print python3_message
+            print('INFO: Not building the Python 3 package because the Python '
+                  '3 interpreter %r could not be found or a required dependency '
+                  '(e.g. numpy) was not found.' % env['python3_cmd'])
+            print(python3_message)
             env['python3_package'] = 'n'
         else:
-            print ('ERROR: Could not execute the Python 3 interpreter %r or a '
-                   'required dependency (e.g. numpy) could not be found.' %
-                   env['python3_cmd'])
-            print python3_message
+            print('ERROR: Could not execute the Python 3 interpreter %r or a '
+                  'required dependency (e.g. numpy) could not be found.' %
+                  env['python3_cmd'])
+            print(python3_message)
             sys.exit(1)
     else:
-        print 'INFO: Building Python package for Python {0}'.format(env['python3_version'])
+        print('INFO: Building Python package for Python {0}'.format(env['python3_version']))
         env['python3_package'] = 'y'
 
 
@@ -1277,7 +1278,7 @@ if env['matlab_path'] != '' and env['matlab_toolbox'] == 'default':
 if env['matlab_toolbox'] == 'y':
     matPath = env['matlab_path']
     if matPath == '':
-        print "ERROR: Unable to build the Matlab toolbox because 'matlab_path' has not been set."
+        print("ERROR: Unable to build the Matlab toolbox because 'matlab_path' has not been set.")
         sys.exit(1)
 
     if env['blas_lapack_libs']:
@@ -1298,8 +1299,8 @@ if env['matlab_toolbox'] == 'y':
 
     if not (os.path.isdir(matPath) and
             os.path.isdir(pjoin(matPath, 'extern'))):
-        print """ERROR: Path set for 'matlab_path' is not correct."""
-        print """ERROR: Path was: '%s'""" % matPath
+        print("""ERROR: Path set for 'matlab_path' is not correct.""")
+        print("""ERROR: Path was: '%s'""" % matPath)
         sys.exit(1)
 
 
@@ -1612,15 +1613,15 @@ if 'samples' in COMMAND_LINE_TARGETS or addInstallActions:
 build_samples = Alias('samples', sampleTargets)
 
 def postBuildMessage(target, source, env):
-    print "*******************************************************"
-    print "Compilation completed successfully.\n"
-    print "- To run the test suite, type 'scons test'."
+    print("*******************************************************")
+    print("Compilation completed successfully.\n")
+    print("- To run the test suite, type 'scons test'.")
     if os.name == 'nt':
-        print "- To install, type 'scons install'."
-        print "- To create a Windows MSI installer, type 'scons msi'."
+        print("- To install, type 'scons install'.")
+        print("- To create a Windows MSI installer, type 'scons msi'.")
     else:
-        print "- To install, type '[sudo] scons install'."
-    print "*******************************************************"
+        print("- To install, type '[sudo] scons install'.")
+    print("*******************************************************")
 
 finish_build = env.Command('finish_build', [], postBuildMessage)
 env.Depends(finish_build, buildTargets)
@@ -1639,7 +1640,7 @@ def postInstallMessage(target, source, env):
 
     env['matlab_sample_loc'] = pjoin(env['ct_sampledir'], 'matlab')
     env['matlab_ctpath_loc'] = pjoin(env['ct_matlab_dir'], 'ctpath.m')
-    print """
+    print("""
 Cantera has been successfully installed.
 
 File locations:
@@ -1648,36 +1649,36 @@ File locations:
   library files               %(ct_libdir)s
   C++ headers                 %(ct_incroot)s
   samples                     %(ct_sampledir)s
-  data files                  %(ct_datadir)s""" % env,
+  data files                  %(ct_datadir)s""" % env, end='')
 
     if env['python_package'] == 'full':
-        print """
+        print("""
   Python 2 package (cantera)  %(python_module_loc)s
-  Python 2 samples            %(python_example_loc)s""" % env,
+  Python 2 samples            %(python_example_loc)s""" % env, end='')
     elif warn_no_python:
-        print """
+        print("""
     #################################################################
      WARNING: the Cantera Python package was not installed because
      the prerequisites (Cython and NumPy) could not be found.
-    #################################################################"""
+    #################################################################""")
 
     if env['python3_package'] == 'y':
-        print """
+        print("""
   Python 3 package (cantera)  %(python3_module_loc)s
-  Python 3 samples            %(python3_example_loc)s""" % env,
+  Python 3 samples            %(python3_example_loc)s""" % env, end='')
 
     if env['matlab_toolbox'] == 'y':
-        print """
+        print("""
   Matlab toolbox              %(ct_matlab_dir)s
   Matlab samples              %(matlab_sample_loc)s
 
 An m-file to set the correct matlab path for Cantera is at:
 
   %(matlab_ctpath_loc)s
-    """ % env,
+    """ % env, end='')
 
     if os.name != 'nt':
-        print """
+        print("""
   setup script                %(ct_bindir)s/setup_cantera
 
 The setup script configures the environment for Cantera. It is recommended that
@@ -1686,9 +1687,9 @@ you run this script by typing:
   source %(ct_bindir)s/setup_cantera
 
 before using Cantera, or else include its contents in your shell login script.
-    """ % env
+    """ % env)
     else:
-        print ''
+        print('')
 
 finish_install = env.Command('finish_install', [], postInstallMessage)
 env.Depends(finish_install, installTargets)
@@ -1793,9 +1794,9 @@ if any(target.startswith('test') for target in COMMAND_LINE_TARGETS):
     SConscript('test_problems/SConscript')
 
     if 'test-help' in COMMAND_LINE_TARGETS:
-        print '\n*** Available tests ***\n'
+        print('\n*** Available tests ***\n')
         for name in env['testNames']:
-            print 'test-%s' % name
+            print('test-%s' % name)
         sys.exit(0)
 
     Alias('test', env['test_results'])
@@ -1804,6 +1805,6 @@ if any(target.startswith('test') for target in COMMAND_LINE_TARGETS):
 if 'dump' in COMMAND_LINE_TARGETS:
     import pprint
     # Typical usage: 'scons build dump'
-    print 'os.environ:\n', pprint.pprint(dict(os.environ))
-    print 'env.Dump():\n', env.Dump()
+    print('os.environ:\n', pprint.pprint(dict(os.environ)))
+    print('env.Dump():\n', env.Dump())
     sys.exit(0)
diff --git a/doc/SConscript b/doc/SConscript
index 59a026df1..4475e65a3 100644
--- a/doc/SConscript
+++ b/doc/SConscript
@@ -1,3 +1,4 @@
+from __future__ import print_function
 from buildutils import *
 import ast
 
@@ -60,7 +61,7 @@ def extract_matlab_docstring(mfile, level):
     elif level == 1:
         docstring = "    .. mat:function:: "
     else:
-        print "Unknown level for MATLAB documentation."
+        print("Unknown level for MATLAB documentation.")
         sys.exit(1)
 
     # The leader is the number of spaces at the beginning of a regular line
@@ -109,7 +110,7 @@ def get_function_name(str):
     elif str.startswith('classdef '):
         sig = str[len('classdef '):]
     else:
-        print "Unknown function declaration in MATLAB document", str
+        print("Unknown function declaration in MATLAB document", str)
 
     # Split the function signature on the equals sign, if it exists.
     # We don't care about what comes before the equals sign, since
diff --git a/platform/posix/coverage.py b/platform/posix/coverage.py
index 4ff08a231..f6143a3e5 100755
--- a/platform/posix/coverage.py
+++ b/platform/posix/coverage.py
@@ -4,6 +4,7 @@
 Collect test coverage data and generate an html report.
 """
 
+from __future__ import print_function
 import os
 import subprocess
 import shutil
@@ -55,7 +56,7 @@ def collect():
     """
     sourcedirs = getDirectories()
     if not sourcedirs:
-        print "Warning! Didn't find any coverage data."
+        print("Warning! Didn't find any coverage data.")
         return
 
     command = ['lcov', '-c',
diff --git a/site_scons/buildutils.py b/site_scons/buildutils.py
index 059dd2c9b..51fd25f3d 100644
--- a/site_scons/buildutils.py
+++ b/site_scons/buildutils.py
@@ -1,3 +1,4 @@
+from __future__ import print_function
 import os
 from os.path import join as pjoin
 from os.path import normpath
@@ -49,8 +50,8 @@ class ConfigBuilder(object):
 
     def __call__(self, source, target, env):
         for s, t in zip(source, target):
-            config_h_in = file(str(s), "r")
-            config_h = file(str(t), "w")
+            config_h_in = open(str(s), "r")
+            config_h = open(str(t), "w")
 
             config_h.write(config_h_in.read() % self.defines)
             config_h_in.close()
@@ -58,12 +59,12 @@ class ConfigBuilder(object):
             self.print_config(str(t))
 
     def print_config(self, filename):
-        print 'Generating %s with the following settings:' % filename
-        for key, val in sorted(self.defines.data.iteritems()):
+        print('Generating %s with the following settings:' % filename)
+        for key, val in sorted(self.defines.data.items()):
             if val is not None:
-                print "    %-35s %s" % (key, val)
+                print("    %-35s %s" % (key, val))
         for key in sorted(self.defines.undefined):
-            print "    %-35s %s" % (key, '*undefined*')
+            print("    %-35s %s" % (key, '*undefined*'))
 
 
 class TestResults(object):
@@ -84,7 +85,7 @@ class TestResults(object):
                         '\n')
         else:
             failures = ''
-        print """
+        print("""
 *****************************
 ***    Testing Summary    ***
 *****************************
@@ -97,7 +98,7 @@ Tests failed: %(failed)s
             passed=sum(self.passed.values()),
             failed=sum(self.failed.values()),
             skipped=len(self.tests),
-            failures=failures)
+            failures=failures))
 
         if self.failed:
             raise SCons.Errors.BuildError(self, 'One or more tests failed.')
@@ -149,7 +150,7 @@ def regression_test(target, source, env):
                                cwd=dir, env=env['ENV'])
 
     if code:
-        print 'FAILED (program exit code:{0})'.format(code)
+        print('FAILED (program exit code:{0})'.format(code))
 
     diff = 0
     # Compare output files
@@ -158,10 +159,10 @@ def regression_test(target, source, env):
         comparisons.append((blessedName,outputName))
 
     for blessed,output in comparisons:
-        print """Comparing '%s' with '%s'""" % (blessed, output)
+        print("""Comparing '%s' with '%s'""" % (blessed, output))
         d = compareFiles(env, pjoin(dir, blessed), pjoin(dir, output))
         if d:
-            print 'FAILED'
+            print('FAILED')
         diff |= d
 
     del testResults.tests[env['active_test_name']]
@@ -172,7 +173,7 @@ def regression_test(target, source, env):
 
         testResults.failed[env['active_test_name']] = 1
     else:
-        print 'PASSED'
+        print('PASSED')
         open(target[0].path, 'w').write(time.asctime()+'\n')
         testResults.passed[env['active_test_name']] = 1
 
@@ -243,7 +244,7 @@ def compareTextFiles(env, file1, file2):
                 abserr = abs(num1-num2)
                 relerr = abserr / (0.5 * abs(num1 + num2) + atol)
                 if abserr > (1.1*delta + atol) and relerr > rtol:
-                    print 'Values differ: {0: 14g} {1: 14g}; rel. err = {2:.3e}; abs. err = {3:.3e}'.format(num1, num2, relerr, abserr)
+                    print('Values differ: {0: 14g} {1: 14g}; rel. err = {2:.3e}; abs. err = {3:.3e}'.format(num1, num2, relerr, abserr))
                     allMatch = False
                     break
             except Exception as e:
@@ -259,10 +260,10 @@ def compareTextFiles(env, file1, file2):
     # Try the comparison again
     diff = list(difflib.unified_diff(text1, text2))
     if diff:
-        print 'Found differences between %s and %s:' % (file1, file2)
-        print '>>>'
-        print '\n'.join(diff)
-        print '<<<'
+        print('Found differences between %s and %s:' % (file1, file2))
+        print('>>>')
+        print('\n'.join(diff))
+        print('<<<')
         return 1
 
     return 0
@@ -314,7 +315,7 @@ def compareCsvFiles(env, file1, file2):
     try:
         import numpy as np
     except ImportError:
-        print 'WARNING: skipping .csv diff because numpy is not installed'
+        print('WARNING: skipping .csv diff because numpy is not installed')
         return 0
 
     # decide how many header lines to skip
@@ -331,7 +332,7 @@ def compareCsvFiles(env, file1, file2):
         data1 = np.genfromtxt(file1, skip_header=headerRows, delimiter=',')
         data2 = np.genfromtxt(file2, skip_header=headerRows, delimiter=',')
     except (IOError, StopIteration) as e:
-        print e
+        print(e)
         return 1
 
     try:
@@ -340,21 +341,21 @@ def compareCsvFiles(env, file1, file2):
                      env['test_csv_threshold']))
         maxerror = np.nanmax(relerror.flat)
     except ValueError as e:
-        print e
+        print(e)
         return 1
 
     tol = env['test_csv_tolerance']
     if maxerror > tol: # Threshold based on printing 6 digits in the CSV file
-        print ("Files differ. %i / %i elements above specified tolerance (%f)" %
-               (np.sum(relerror > tol), relerror.size, tol))
-        print '  row   col   reference     test          rel. error'
-        print '  ----  ----  ------------  ------------  ----------'
+        print("Files differ. %i / %i elements above specified tolerance (%f)" %
+              (np.sum(relerror > tol), relerror.size, tol))
+        print('  row   col   reference     test          rel. error')
+        print('  ----  ----  ------------  ------------  ----------')
         for i,j in itertools.product(*map(range, relerror.shape)):
             if relerror[i,j] > tol:
                 row = i + headerRows + 1
                 col = j + 1
-                print ('  % 4i  % 4i  % 12f  % 12f  % 10f' %
-                       (row, col, data1[i,j], data2[i,j], relerror[i,j]))
+                print('  % 4i  % 4i  % 12f  % 12f  % 10f' %
+                      (row, col, data1[i,j], data2[i,j], relerror[i,j]))
         return 1
     else:
         return 0
@@ -514,23 +515,23 @@ def listify(value):
     Convert an option specified as a string to a list, using spaces as
     delimiters. Passes lists transparently.
     """
-    if isinstance(value, types.StringTypes):
-        return value.split()
-    else:
+    if isinstance(value, (list, tuple)):
         # Already a sequence. Return as a list
         return list(value)
-
+    else:
+        # assume `value` is a string
+        return value.split()
 
 def removeFile(name):
     """ Remove file (if it exists) and print a log message """
     if os.path.exists(name):
-        print 'Removing file "%s"' % name
+        print('Removing file "%s"' % name)
         os.remove(name)
 
 def removeDirectory(name):
     """ Remove directory recursively and print a log message """
     if os.path.exists(name):
-        print 'Removing directory "%s"' % name
+        print('Removing directory "%s"' % name)
         shutil.rmtree(name)
 
 def ipdb():
@@ -584,9 +585,9 @@ def getSpawn(env):
         data, err = proc.communicate()
         rv = proc.wait()
         if rv:
-            print "====="
-            print err
-            print "====="
+            print("=====")
+            print(err)
+            print("=====")
         return rv
 
     return ourSpawn
@@ -601,7 +602,10 @@ def getCommandOutput(cmd, *args):
         # Can cause problems when trying to run a different Python interpreter
         del environ['PYTHONHOME']
     data = subprocess.check_output([cmd] + list(args), env=environ)
-    return data.strip()
+    if sys.version_info.major == 3:
+        return data.strip().decode('utf-8')
+    else:
+        return data.strip()
 
 # Monkey patch for SCons Cygwin bug
 # See http://scons.tigris.org/issues/show_bug.cgi?id=2664
diff --git a/site_scons/site_tools/gch.py b/site_scons/site_tools/gch.py
index 65328d43c..0819db63d 100644
--- a/site_scons/site_tools/gch.py
+++ b/site_scons/site_tools/gch.py
@@ -39,7 +39,7 @@
 #  env['Gch'] = env.Gch(target='common/includes/all.h.gch', source=env['precompiled_header'])
 
 
-
+from __future__ import print_function
 import SCons.Action
 import SCons.Builder
 import SCons.Scanner.C
@@ -79,7 +79,7 @@ def header_path(node):
         raise SCons.Errors.StopError("{0} file doesn't have .gch extension".format(h_path))
 
 def dump_node(node):
-    print '~Attrs for '+str(node)
+    print('~Attrs for '+str(node))
     for attr_name in sorted(dir(node)):
         if attr_name[0] == '_':
             continue
@@ -87,7 +87,7 @@ def dump_node(node):
         if type(attr) == list:
             attr = [str(x) for x in attr]
         if not callable(attr):
-            print '~',attr_name+":", attr
+            print('~',attr_name+":", attr)
 
 
 inc_re = re.compile(r'#include\s*"([a-zA-Z0-9._]+)"')
@@ -117,7 +117,7 @@ def pch_emitter(pch_env_key, target, source, env):
     if env.get(pch_env_key):
         if _directly_includes_header(src, os.path.basename(env['precompiled_header'].path)):
             if 'explain' in env.GetOption('debug'):
-                print 'Found dep. on pch: ', source[0], ' -> ', env[pch_env_key]
+                print('Found dep. on pch: ', source[0], ' -> ', env[pch_env_key])
             env.Depends(target, env[pch_env_key])
     return (target, source)
 
diff --git a/site_scons/wxsgen.py b/site_scons/wxsgen.py
index ec3df0c27..e71571922 100644
--- a/site_scons/wxsgen.py
+++ b/site_scons/wxsgen.py
@@ -1,3 +1,4 @@
+from __future__ import print_function
 import os, sys
 import uuid
 import xml.etree.ElementTree as et
@@ -199,7 +200,7 @@ def indent(elem, level=0):
 
 
 def usage():
-    print "Usage: wxsgen <stageDir> <outputFile>"
+    print("Usage: wxsgen <stageDir> <outputFile>")
 
 if __name__ == '__main__':
     if len(sys.argv) != 3:
diff --git a/test/SConscript b/test/SConscript
index 42977e779..8ebd0806d 100644
--- a/test/SConscript
+++ b/test/SConscript
@@ -1,3 +1,4 @@
+from __future__ import print_function
 from buildutils import *
 import subprocess
 from xml.etree import ElementTree
@@ -56,7 +57,7 @@ def addTestProgram(subdir, progName, env_vars={}):
         code = subprocess.call(cmd, env=env['ENV'], cwd=workDir)
 
         if code:
-            print "FAILED: Test '{0}' exited with code {1}".format(progName, code)
+            print("FAILED: Test '{0}' exited with code {1}".format(progName, code))
         else:
             # Test was successful
             open(passedFile.path, 'w').write(time.asctime()+'\n')
@@ -111,8 +112,8 @@ def addPythonTest(testname, subdir, script, interpreter, outfile,
             os.remove(outfile)
 
         environ = dict(env['ENV'])
-        for k,v in env_vars.iteritems():
-            print k,v
+        for k,v in env_vars.items():
+            print(k,v)
             environ[k] = v
         code = subprocess.call([env.subst(interpreter), source[0].abspath] + args.split(),
                                env=environ)
@@ -179,9 +180,9 @@ def addMatlabTest(script, testName, dependencies=None, env_vars=()):
                                matlabOptions + ['-r', runCommand],
                                env=environ, cwd=Dir('#test/matlab').abspath)
         results = open(outfile).read()
-        print '-------- Matlab test results --------'
-        print results
-        print '------ end Matlab test results ------'
+        print('-------- Matlab test results --------')
+        print(results)
+        print('------ end Matlab test results ------')
         if 'FAILED' in results:
             testResults.failed[passedFile.name] = 1
         else: