update from Atlas

attic/control/adder/yield_from_input.py

@@ -0,0 +1,42 @@
+import sys
+
+
+def ask():
+    prompt = '>'
+    while True:
+        response = input(prompt)
+        if not response:
+            return 0
+        yield response
+
+
+def parse_args():
+    yield from iter(sys.argv[1:])
+
+
+def fetch(producer):
+    gen = producer()
+    next(gen)
+    yield from gen
+
+
+def main(args):
+    if args:
+        producer = parse_args
+    else:
+        producer = ask
+
+    total = 0
+    count = 0
+    gen = fetch(producer())
+    while True:
+        term = yield from gen
+        term = float(term)
+        total += term
+        count += 1
+        average = total / count
+        print('total: {}  average: {}'.format(total, average))
+
+
+if __name__ == '__main__':
+    main(sys.argv[1:])