diff --git a/10-seq-hacking/vector_v4.py b/10-seq-hacking/vector_v4.py
index cb6d1e6..03e32c4 100644
--- a/10-seq-hacking/vector_v4.py
+++ b/10-seq-hacking/vector_v4.py
@@ -160,6 +160,7 @@ class Vector:
def __init__(self, components):
self._components = array(self.typecode, components)
+ self._hash = None
def __iter__(self):
return iter(self._components)
@@ -177,12 +178,17 @@ def __bytes__(self):
bytes(self._components))
def __eq__(self, other):
- return (len(self) == len(other) and
+ return (hash(self) == hash(other) and len(self) == len(other) and
all(a == b for a, b in zip(self, other)))
def __hash__(self):
+ if self._hash:
+ return self._hash
+
hashes = (hash(x) for x in self)
- return functools.reduce(operator.xor, hashes, 0)
+ self._hash = functools.reduce(operator.xor, hashes, 0)
+
+ return self._hash
def __abs__(self):
return math.sqrt(sum(x * x for x in self))
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