use byte strings

Author: pipermerriam

ethereum/chain.py

@@ -110,7 +110,7 @@ class Chain(object):
     """
     head_candidate = None
 
-    def __init__(self, env, genesis=None, new_head_cb=None, coinbase='\x00' * 20):
+    def __init__(self, env, genesis=None, new_head_cb=None, coinbase=b'\x00' * 20):
         assert isinstance(env, Env)
         self.env = env
         self.db = self.blockchain = env.db

ethereum/ethash.py

@@ -9,7 +9,7 @@
     from functools import lru_cache
 
 
-cache_seeds = ['\x00' * 32]
+cache_seeds = [b'\x00' * 32]
 
 
 def mkcache(block_number):

ethereum/keys.py

@@ -247,7 +247,7 @@ def big_endian_to_int(value):
         if len(value) == 1:
             return ord(value)
         elif len(value) <= 8:
-            return struct.unpack('>Q', value.rjust(8, '\x00'))[0]
+            return struct.unpack('>Q', value.rjust(8, b'\x00'))[0]
         else:
             return int(encode_hex(value), 16)
 

ethereum/transactions.py

@@ -114,7 +114,7 @@ def sign(self, key):
 
         A potentially already existing signature would be overridden.
         """
-        if key in (0, '', '\x00' * 32, '0' * 64):
+        if key in (0, '', b'\x00' * 32, '0' * 64):
             raise InvalidTransaction("Zero privkey cannot sign")
         rawhash = utils.sha3(rlp.encode(self, UnsignedTransaction))
 

ethereum/utils.py

@@ -163,7 +163,7 @@ def zpad(x, l):
 
 def zunpad(x):
     i = 0
-    while i < len(x) and (x[i] == 0 or x[i] == '\x00'):
+    while i < len(x) and (x[i] == 0 or x[i] == b'\x00'):
         i += 1
     return x[i:]
 
@@ -254,7 +254,7 @@ def decode_addr(v):
 
 def decode_int(v):
     '''decodes and integer from serialization'''
-    if len(v) > 0 and (v[0] == '\x00' or v[0] == 0):
+    if len(v) > 0 and (v[0] == b'\x00' or v[0] == 0):
         raise Exception("No leading zero bytes allowed for integers")
     return big_endian_to_int(v)