Add all the A tasks

Task/Averages-Simple-moving-average/Python/averages-simple-moving-average-1.py

@@ -0,0 +1,17 @@
+from collections import deque
+
+def simplemovingaverage(period):
+    assert period == int(period) and period > 0, "Period must be an integer >0"
+
+    summ = n = 0.0
+    values = deque([0.0] * period)     # old value queue
+
+    def sma(x):
+        nonlocal summ, n
+
+        values.append(x)
+        summ += x - values.popleft()
+        n = min(n+1, period)
+        return summ / n
+
+    return sma