March 2014 update

Task/Subtractive-generator/Python/subtractive-generator-2.py

@@ -0,0 +1,23 @@
+import collections
+
+_ten2nine = 10**9
+
+class Subtractive_generator():
+
+    def __init__(self, seed=292929):
+        self.r = collections.deque(maxlen=55)
+        s = collections.deque(maxlen=55)
+        s.extend([seed, 1])
+        s.extend((s[n-2] - s[n-1]) % _ten2nine for n in range(2, 55))
+        self.r.extend(s[(34 * (n+1)) % 55] for n in range(55))
+        for n in range(219 - 54):
+            self()
+
+    def __call__(self):
+        r = self.r
+        r.append((r[0] - r[31]) % _ten2nine)
+        return r[54]
+
+if __name__ == '__main__':
+    srand = Subtractive_generator()
+    print([srand() for i in range(5)])