1 files changed, 12 insertions, 0 deletions
diff --git a/setcross.py b/setcross.py
new file mode 100644
index 0000000..fa1b865
--- /dev/null
+++ b/setcross.py
@@ -0,0 +1,12 @@
+def cross(first, *args):
+    """
+    find cross product of two sets.
+    """
+    retval = set([ (x,) for x in first ])
+    for arg in args:
+        next = set()
+        for a in retval:
+            for b in arg:
+                next.add(a + (b,))
+        retval = next
+    return retval