A couple of fixes

Author: vbuterin

.release_notify.sh

@@ -107,7 +107,7 @@ def sign(self, key, network_id=None):
             rawhash = utils.sha3(rlp.encode(self, UnsignedTransaction))
         else:
             assert 1 <= network_id < 2**63 - 18
-            rlpdata = rlp.encode(rlp.infer_sedes(self).serialize(self)[:-3] + [big_endian_to_int(network_id), b'', b''])
+            rlpdata = rlp.encode(rlp.infer_sedes(self).serialize(self)[:-3] + [network_id, b'', b''])
             rawhash = utils.sha3(rlpdata)
 
         key = normalize_key(key)

ethereum/transactions.py

@@ -14,8 +14,7 @@
 try:
     import secp256k1
 except ImportError:
-    import warning
-    warning.ImportWarning('could not import secp256k1')
+    print('could not import secp256k1')
     secp256k1 = None
 
 big_endian_to_int = lambda x: big_endian_int.deserialize(str_to_bytes(x).lstrip(b'\x00'))

ethereum/utils.py

@@ -7,4 +7,3 @@ pycryptodome>=3.3.1
 scrypt
 rlp>=0.4.7
 https://github.com/ethereum/ethash/tarball/master
-secp256k1