modified Vector v4 equality check by adnanmuttaleb · Pull Request #35 · fluentpython/example-code

Expand Up @@ -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) Expand All @@ -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)) Expand Down