sync to Atlas repo

iterables/aritprog_v2.py

@@ -0,0 +1,32 @@
+"""
+Arithmetic progression class
+
+    >>> ap = ArithmeticProgression(1, .5, 3)
+    >>> list(ap)
+    [1.0, 1.5, 2.0, 2.5]
+
+
+"""
+
+import array
+from collections import abc
+
+class ArithmeticProgression:
+
+    def __init__(self, begin, step, end):
+        self.begin = begin
+        self.step = step
+        self.end = end
+        self._build()
+
+    def _build(self):
+        self._numbers = array.array('d')
+        n = self.begin
+        while n < self.end:
+            self._numbers.append(n)
+            n += self.step
+
+    def __iter__(self):
+        for item in self._numbers:
+            yield item
+        return StopIteration