python · gvanrossum · Jan 15, 2021
diff --git a/pyperformance/benchmarks/bm_read_instancevar_slots.py b/pyperformance/benchmarks/bm_read_instancevar_slots.py
@@ -0,0 +1,36 @@
+"""
+Exercise reading instance members defined by __slots__.
+"""
+import pyperf
+
+
+REPS = 100000
+
+
+class Point:
+    __slots__ = ("a", "b", "c")
+
+    def __init__(self, a=0, b=0, c=0):
+        self.a = a
+        self.b = b
+        self.c = c
+
+
+def read_vars(p):
+    return p.a + p.b + p.c
+
+
+def benchmark(n):
+    p = Point()
+    assert read_vars(p) == 0
+    for i in range(n):
+        read_vars(p)
+    assert read_vars(p) == 0
+
+
+if __name__ == "__main__":
+    runner = pyperf.Runner()
+    runner.metadata['description'] = "Read __slots__ benchmark"
+
+    reps = REPS
+    runner.bench_func('read_instancevar_slots', benchmark, reps)