Remove __future__ and six imports

scripts/openmc-ace-to-hdf5

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import argparse
 import os

scripts/openmc-convert-mcnp70-data

@@ -1,6 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
-from __future__ import print_function
 import argparse
 from collections import defaultdict
 import glob

scripts/openmc-convert-mcnp71-data

@@ -1,6 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
-from __future__ import print_function
 import argparse
 from collections import defaultdict
 import glob

scripts/openmc-get-jeff-data

@@ -1,6 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
-from __future__ import print_function
 import os
 from collections import defaultdict
 import sys
@@ -9,9 +8,7 @@ import zipfile
 import glob
 import argparse
 from string import digits
-
-from six.moves import input
-from six.moves.urllib.request import urlopen
+from urllib.request import urlopen
 
 import openmc.data
 

scripts/openmc-get-multipole-data

@@ -1,6 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
-from __future__ import print_function
 import os
 import shutil
 import subprocess
@@ -9,9 +8,7 @@ import tarfile
 import glob
 import hashlib
 import argparse
-
-from six.moves import input
-from six.moves.urllib.request import urlopen
+from urllib.request import urlopen
 
 
 description = """

scripts/openmc-get-nndc-data

@@ -1,6 +1,5 @@
 #!/usr/bin/env python
 
-from __future__ import print_function
 import os
 import shutil
 import subprocess
@@ -9,9 +8,7 @@ import tarfile
 import glob
 import hashlib
 import argparse
-
-from six.moves import input
-from six.moves.urllib.request import urlopen
+from urllib.request import urlopen
 
 import openmc.data
 

scripts/openmc-plot-mesh-tally

@@ -1,16 +1,16 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """Python script to plot tally data generated by OpenMC."""
 
 import os
 import sys
 import argparse
+import tkinter as tk
+import tkinter.filedialog as filedialog
+import tkinter.font as font
+import tkinter.messagebox as messagebox
+import tkinter.ttk as ttk
 
-import six.moves.tkinter as tk
-import six.moves.tkinter_filedialog as filedialog
-import six.moves.tkinter_font as font
-import six.moves.tkinter_messagebox as messagebox
-import six.moves.tkinter_ttk as ttk
 from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
 from matplotlib.backends.backend_tkagg import NavigationToolbar2TkAgg
 from matplotlib.figure import Figure

scripts/openmc-track-to-vtk

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """Convert HDF5 particle track to VTK poly data.
 

scripts/openmc-update-inputs

@@ -1,10 +1,8 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """Update OpenMC's input XML files to the latest format.
 
 """
 
-from __future__ import print_function
-
 import argparse
 from difflib import get_close_matches
 from itertools import chain

scripts/openmc-update-mgxs

@@ -1,10 +1,9 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """Update OpenMC's deprecated multi-group cross section XML files to the latest
 HDF5-based format.
 
 """
 
-from __future__ import print_function
 import os
 import warnings
 import xml.etree.ElementTree as ET

scripts/openmc-validate-xml

@@ -1,6 +1,4 @@
-#!/usr/bin/env python
-
-from __future__ import print_function
+#!/usr/bin/env python3
 
 import os
 import sys

scripts/openmc-voxel-to-silovtk

@@ -1,6 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
-from __future__ import division, print_function
 import struct
 import sys
 from argparse import ArgumentParser