Drop python2 stuff in plotting script

tools/plotting/fastnnlo_statunc.py

 #!/usr/bin/env python3
-#-*- coding:utf-8 -*-
+# -*- coding:utf-8 -*-
 #
 ########################################################################
 #
@@ -9,10 +9,13 @@
 #
 ########################################################################
 #
-# python2 compatibility
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
+# fastNLO for direct evaluation of interpolation grids
+# ATTENTION: fastNLO python extension is required for Python 3!
+from fastnlo import SetGlobalVerbosity
+from fastnlo import fastNLOLHAPDF
+import fastnlo
+import numpy as np
+import matplotlib.pyplot as plt
 import argparse
 import glob
 import os
@@ -22,7 +25,8 @@ import sys
 import timeit
 import matplotlib as mpl
 import matplotlib.gridspec as gridspec
-from matplotlib.ticker import (FormatStrFormatter, LogFormatter, NullFormatter, ScalarFormatter, AutoMinorLocator, MultipleLocator)
+from matplotlib.ticker import (FormatStrFormatter, LogFormatter,
+                               NullFormatter, ScalarFormatter, AutoMinorLocator, MultipleLocator)
 from matplotlib import cm
 # We do not want any interactive plotting! Figures are saved to files instead.
 # This also avoids the ANNOYANCE of frequently missing Tkinter/tkinter (python2/3) GUI backends!
@@ -56,20 +60,17 @@ else:
     useagg = True
     try:
         mpl.use(backend, force=True)
-        print('[fastnnlo_statunc]: Warning! Could not import cairo backend :-( Using agg instead for raster plots only!')
+        print(
+            '[fastnnlo_statunc]: Warning! Could not import cairo backend :-( Using agg instead for raster plots only!')
     except:
         useagg = False
         print('[fastnnlo_statunc]: Can not use agg backend :-(')
-        raise ImportError('[fastnnlo_statunc]: Neither cairo nor agg backend found :-( Cannot produce any plots. Good bye!')
+        raise ImportError(
+            '[fastnnlo_statunc]: Neither cairo nor agg backend found :-( Cannot produce any plots. Good bye!')
     mpl.use('agg')
-import matplotlib.pyplot as plt
 # numpy
-import numpy as np
 # fastNLO for direct evaluation of interpolation grids
 # ATTENTION: fastNLO python extension is required for Python 3!
-import fastnlo
-from fastnlo import fastNLOLHAPDF
-from fastnlo import SetGlobalVerbosity
 #import warnings
 #warnings.filterwarnings("error")