@@ -0,0 +1,31 @@
+import functools
+import time
+import tracemalloc
+
+
+def performance(fn):
+    """
+    This decorator measures the time and memory of the calls of a function.
+    The statistics of all decorated functions are saved in its attributes.
+    """
+
+    @functools.wraps(fn)
+    def wrapper(*args, **kwargs):
+        # shortcut: a decorated function calling another one under-reports
+        # memory because tracemalloc is global, keep calls flat to stay exact
+        tracemalloc.start()
+        start = time.perf_counter()
+        try:
+            return fn(*args, **kwargs)
+        finally:
+            performance.total_time += time.perf_counter() - start
+            performance.total_mem += tracemalloc.get_traced_memory()[1]
+            performance.counter += 1
+            tracemalloc.stop()
+
+    return wrapper
+
+
+performance.counter = 0
+performance.total_time = 0
+performance.total_mem = 0