updated from Atlas repo

iterables/aritprog.rst

@@ -0,0 +1,31 @@
+===========================================
+Tests for arithmetic progression generators
+===========================================
+
+Tests with built-in numeric types::
+
+    >>> ap = aritprog_gen(1, .5, 3)
+    >>> list(ap)
+    [1.0, 1.5, 2.0, 2.5]
+    >>> ap = aritprog_gen(0, 1/3, 1)
+    >>> list(ap)
+    [0.0, 0.3333333333333333, 0.6666666666666666]
+
+
+Tests with standard library numeric types::
+
+    >>> from fractions import Fraction
+    >>> ap = aritprog_gen(0, Fraction(1, 3), 1)
+    >>> list(ap)
+    [Fraction(0, 1), Fraction(1, 3), Fraction(2, 3)]
+    >>> from decimal import Decimal
+    >>> ap = aritprog_gen(0, Decimal('.1'), .3)
+    >>> list(ap)
+    [Decimal('0'), Decimal('0.1'), Decimal('0.2')]
+
+
+Test producing an empty series::
+
+    >>> ap = aritprog_gen(0, 1, 0)
+    >>> list(ap)
+    []