Perf demo of zero cost exceptions.

mikeckennedy · mikeckennedy · commit e01e49f3a806 · 2022-12-20T17:36:06.000-08:00
diff --git a/code/ch04-error-handling/zero-cost-exceptions.py b/code/ch04-error-handling/zero-cost-exceptions.py
@@ -0,0 +1,43 @@
+import datetime
+from dis import dis
+
+
+def troubling_method(x: str) -> int:
+    # print(f"We will take a shot at converting {x}")
+
+    try:
+        return int(x)
+    except ValueError as ve:
+        print(f"Oh no, it couldn't be converted because of values: {ve}")
+    except NotImplementedError:
+        print("Somehow not implemented?")
+    except:
+        print("We have no idea")
+
+    # print("There was some kind of error")
+    return -1
+
+
+def main():
+    troubling_method("77")
+
+    # print(troubling_method("77"))
+    # print(troubling_method("901"))
+    # # print(troubling_method(902))
+    # print(troubling_method("Nine hundred"))
+    #
+    # dis(troubling_method)
+
+    times = 10_000_000
+    t0 = datetime.datetime.now()
+
+    for _ in range(times):
+        troubling_method("77")
+
+    t1 = datetime.datetime.now()
+    dt = t1-t0
+    print(f"Done in {dt.total_seconds()* 1000:,.2f} ms")
+
+
+if __name__ == '__main__':
+    main()
