Fix Python code: remove imports from `python-future`.

I missed in 3d6ba937a5a5046b3d531c17691d5d1155daae71 that `future`
also provides the modules `past` and `builtins`.
Imports of `builtins` can simply be removed for Python-3-only code.
`past.old_div` had to be replaces by the "old" div-operatot `//`,
while `past.xrange` was unused.

1 files changed, 2 insertions, 6 deletions

diff --git a/contrib/scripts/gnunet-chk.py.in b/contrib/scripts/gnunet-chk.py.in
index ab0bc635f..0fb591627 100755
--- a/contrib/scripts/gnunet-chk.py.in
+++ b/contrib/scripts/gnunet-chk.py.in
@@ -21,10 +21,6 @@
 # Brief:   Computes GNUNET style Content Hash Key for a given file
 # Author:  Sree Harsha Totakura
 
-from builtins import str
-from builtins import range
-from past.utils import old_div
-from builtins import object
 from hashlib import sha512
 import logging
 import os
@@ -252,7 +248,7 @@ def compute_chk_offset_(depth, end_offset):
     bds = compute_tree_size_(depth)
     if (depth > 0):
         end_offset -= 1
-    ret = old_div(end_offset, bds)
+    ret = end_offset // bds
     return ret % CHK_PER_INODE
 
 
@@ -276,7 +272,7 @@ def compute_iblock_size_(depth, offset):
         ret = CHK_PER_INODE
     else:
         bds /= CHK_PER_INODE
-        ret = old_div(mod, bds)
+        ret = mod // bds
         if (mod % bds) is not 0:
             ret += 1
     return ret