updated from Atlas

attic/control/adder/yetanother.py

@@ -0,0 +1,47 @@
+import sys
+import collections
+
+Result = collections.namedtuple('Result', 'total average')
+
+def adder():
+    total = 0
+    count = 0
+    while True:
+        term = yield
+        try:
+            term = float(term)
+        except (ValueError, TypeError):
+            break
+        else:
+            total += term
+            count += 1
+    return Result(total, total/count)
+
+def process_args(coro, args):
+    for arg in args:
+        coro.send(arg)
+    try:
+        next(coro)
+    except StopIteration as exc:
+        return exc.value
+
+
+def prompt(coro):
+    while True:
+        term = input('+> ')
+        try:
+            coro.send(term)
+        except StopIteration as exc:
+            return exc.value
+
+
+def main():
+    coro = adder()
+    next(coro)  # prime it
+    if len(sys.argv) > 1:
+        res = process_args(coro, sys.argv[1:])
+    else:
+        res = prompt(coro)
+    print(res)
+
+main()