Data commit

Task/Knuths-algorithm-S/Python/knuths-algorithm-s-2.py

@@ -0,0 +1,16 @@
+class S_of_n_creator():
+    def __init__(self, n):
+        self.n = n
+        self.i = 0
+        self.sample = []
+
+    def __call__(self, item):
+        self.i += 1
+        n, i, sample = self.n, self.i, self.sample
+        if i <= n:
+            # Keep first n items
+            sample.append(item)
+        elif randrange(i) < n:
+            # Keep item
+            sample[randrange(n)] = item
+        return sample