1 files changed, 5 insertions, 6 deletions
diff --git a/test/functional/test_framework/bignum.py b/test/functional/test_framework/bignum.py
index db5ccd62c2..0dd4ea4b42 100644
--- a/test/functional/test_framework/bignum.py
+++ b/test/functional/test_framework/bignum.py
@@ -4,25 +4,24 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Big number routines.
 
+Functions for converting numbers to MPI format and Bitcoin-specific little
+endian format.
+
 This file is copied from python-bitcoinlib.
 """
-
 import struct
 
-
-# generic big endian MPI format
-
 def bn_bytes(v, have_ext=False):
     ext = 0
     if have_ext:
         ext = 1
-    return ((v.bit_length()+7)//8) + ext
+    return (v.bit_length() + 7) // 8 + ext
 
 def bn2bin(v):
     s = bytearray()
     i = bn_bytes(v)
     while i > 0:
-        s.append((v >> ((i-1) * 8)) & 0xff)
+        s.append((v >> ((i - 1) * 8)) & 0xff)
         i -= 1
     return s