Reformat and clean up

monero/keccak.py

@@ -2,9 +2,17 @@ cd_keccak = None
 sha3_keccak = None
 
 try:
-    from Cryptodome.Hash import cd_keccak
+    from Cryptodome.Hash import keccak as cd_keccak
 except ImportError:
+    pass
+if not cd_keccak:
+    try:
         from sha3 import keccak_256 as sha3_keccak
+    except ImportError:
+        raise ImportError(
+            "Could not import 'keccak' from 'Cryptodome.Hash' nor 'keccak_256' from 'sha3'. "
+            "Install one of those modules ('cryptodomex' is the recommended one)."
+        )
 
 
 def keccak_256(data):
@@ -17,5 +25,7 @@ def keccak_256(data):
     elif sha3_keccak is not None:
         h = sha3_keccak(data)
     else:  # pragma: no cover
-        raise RuntimeError("SHA3 implementation is missing. Install either 'pycryptodomex' (recommended) or 'pysha3' package to provide it")
+        raise RuntimeError(
+            "SHA3 implementation is missing. Install either 'pycryptodomex' (recommended) or 'pysha3' package to provide it"
+        )
     return h

monero/seed.py

@@ -134,7 +134,11 @@ class Seed(object):
         return self.sc_reduce(a)
 
     def secret_view_key(self):
-        b = self._hex_seed_keccak() if self.is_mymonero() else unhexlify(self.secret_spend_key())
+        b = (
+            self._hex_seed_keccak()
+            if self.is_mymonero()
+            else unhexlify(self.secret_spend_key())
+        )
         return self.sc_reduce(keccak_256(b).digest())
 
     def public_spend_key(self):
@@ -165,7 +169,9 @@ class Seed(object):
                 )
             )
         netbyte = (18, 53, 24)[const.NETS.index(net)]
-        data = "{:x}{:s}{:s}".format(netbyte, self.public_spend_key(), self.public_view_key())
+        data = "{:x}{:s}{:s}".format(
+            netbyte, self.public_spend_key(), self.public_view_key()
+        )
         checksum = keccak_256(unhexlify(data)).hexdigest()
         return address(base58.encode(data + checksum[0:8]))
 

monero/transaction/__init__.py

@@ -173,10 +173,13 @@ class Transaction(object):
                         amount=amount,
                         timestamp=self.timestamp,
                         transaction=self,
-                        local_address=addr)
+                        local_address=addr,
+                    )
                 amount_hs = keccak_256(b"amount" + Hs).digest()
                 xormask = amount_hs[: len(encamount)]
-                dec_amount = bytearray(a ^ b for a, b in zip(*map(bytearray, (encamount, xormask))))
+                dec_amount = bytearray(
+                    a ^ b for a, b in zip(*map(bytearray, (encamount, xormask)))
+                )
                 int_amount = struct.unpack("<Q", dec_amount)[0]
                 amount = from_atomic(int_amount)
                 return Payment(