Make many scripts in src/utils Python 3 compatible.

src/utils/analyze_source.py

@@ -1,4 +1,6 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
+
+from __future__ import print_function
 
 import sys
 import os
@@ -36,7 +38,7 @@ for sourceFile in source:
         commentChar = '!'
     elif ending == 'F90':
         commentChar = '!'
-    
+
     for line in open(sourceFile, 'r'):
         line = line.strip()
         if line.startswith(commentChar):

src/utils/build_dependencies.py

@@ -1,4 +1,6 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
+
+from __future__ import print_function
 
 import glob
 import re
@@ -18,7 +20,6 @@ for src in glob.iglob('*.F90'):
     if deps:
         dependencies[module] = sorted(list(deps))
 
-
 for module in sorted(dependencies.keys()):
     for dep in dependencies[module]:
         print("{0}.o: {1}.o".format(module, dep))

src/utils/convert_xsdata.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 
 import os
 import sys

src/utils/convert_xsdir.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 
 import os
 import sys

src/utils/eigenfunction_rms.py

@@ -1,12 +1,14 @@
-#!/usr/bin/python2
-# Filename: eigenfunction_rms.py
+#!/usr/bin/env python
+
+from __future__ import print_function
 
-# import packages
-import statepoint
-import numpy as np
 import os
 import sys
 
+import numpy as np
+
+import statepoint
+
 def main(tally_id, score_id, batch_start, batch_end, name):
 
   # read in statepoint header data

src/utils/memory_usage.py

@@ -1,7 +1,12 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 
-# This script reads a cross_sections.out file, adds up the memory usage for
-# each nuclide and S(a,b) table, and displays the total memory usage
+"""
+This script reads a cross_sections.out file, adds up the memory usage for each
+nuclide and S(a,b) table, and displays the total memory usage.
+
+"""
+
+from __future__ import print_function
 
 import sys
 import os

src/utils/plot_mesh_tally.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 
 """Python script to plot tally data generated by OpenMC."""
 
@@ -15,12 +15,16 @@ from statepoint import *
 
 if sys.version_info[0] < 3:
     import Tkinter as tk
+    import tkFileDialog as filedialog
+    import tkFont as font
+    import tkMessageBox as messagebox
+    import ttk as ttk
 else:
     import tkinter as tk
-import tkFileDialog
-import tkFont
-import tkMessageBox
-import ttk
+    import tkinter.filedialog as filedialog
+    import tkinter.font as font
+    import tkinter.messagebox as messagebox
+    import tkinter.ttk as ttk
 
 
 class MeshPlotter(tk.Frame):
@@ -111,8 +115,9 @@ class MeshPlotter(tk.Frame):
         self.scoreBox.bind('<<ComboboxSelected>>', self.redraw)
 
         # Filter label
-        font = tkFont.Font(weight='bold')
-        labelFilters = tk.Label(self.selectFrame, text='Filters:', font=font)
+        boldfont = font.Font(weight='bold')
+        labelFilters = tk.Label(self.selectFrame, text='Filters:',
+                                font=boldfont)
         labelFilters.grid(row=5, column=0, sticky=tk.W)
 
     def update(self, event=None):
@@ -201,7 +206,7 @@ class MeshPlotter(tk.Frame):
 
         # Create spec_list
         spec_list = []
-        for f in selectedTally.filters.values():
+        for f in list(selectedTally.filters.values()):
             if f.type == 'mesh':
                 continue
             index = self.filterBoxes[f.type].current()
@@ -296,8 +301,8 @@ class MeshPlotter(tk.Frame):
                 self.meshTallies.append(itally)
 
         if not self.meshTallies:
-            tkMessageBox.showerror("Invalid StatePoint File",
-                                   "File does not contain mesh tallies!")
+            messagebox.showerror("Invalid StatePoint File",
+                                 "File does not contain mesh tallies!")
             sys.exit(1)
 
 
@@ -308,16 +313,16 @@ if __name__ == '__main__':
 
     # If no filename given as command-line argument, open file dialog
     if len(sys.argv) < 2:
-        filename = tkFileDialog.askopenfilename(title='Select statepoint file',
-                                                initialdir='.')
+        filename = filedialog.askopenfilename(title='Select statepoint file',
+                                              initialdir='.')
     else:
         filename = sys.argv[1]
 
     if filename:
         # Check to make sure file exists
         if not os.path.isfile(filename):
-            tkMessageBox.showerror("File not found",
-                                   "Could not find regular file: " + filename)
+            messagebox.showerror("File not found",
+                                 "Could not find regular file: " + filename)
             sys.exit(1)
 
         app = MeshPlotter(root, filename)

src/utils/split_nuclide.py

@@ -1,5 +1,6 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 
+from __future__ import print_function
 import sys
 
 if len(sys.argv) != 3:

src/utils/statepoint_histogram.py

@@ -1,5 +1,6 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 
+from __future__ import print_function
 from sys import argv
 from math import sqrt
 

src/utils/tally_conv.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
 
 # This program takes OpenMC statepoint binary files and creates a variety of
 # outputs from them which should provide the user with an idea of the
@@ -15,6 +15,7 @@
 # fileType, printxs, showImg, and savetoCSV.  See the options block for more 
 # information.
 
+from __future__ import print_function
 from math import sqrt, pow
 from glob import glob