File python37-3.patch of Package python-celery

From 6ab775eb6b5643311af21557fa84d10ce605eb17 Mon Sep 17 00:00:00 2001
From: Omer Katz <omer.drow@gmail.com>
Date: Fri, 4 Jan 2019 07:12:10 +0200
Subject: [PATCH] Avoid raising StopIterator in generators. (#5263)

According to [PEP-479](https://www.python.org/dev/peps/pep-0479/) StopIteration should not be used any more to indicate the termination of a generator.
Starting from Python 3.7 this behaviour is always enforced and a RuntimeError is raised instead.
Instead of raising a StopIterator exception, we now never execute our yield statement.
Since it is present Gen is still a generator but it will never yield any value.
---
 t/unit/worker/test_loops.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/t/unit/worker/test_loops.py b/t/unit/worker/test_loops.py
index f86f730f16..d57b416e47 100644
--- a/t/unit/worker/test_loops.py
+++ b/t/unit/worker/test_loops.py
@@ -383,8 +383,8 @@ def test_poll_write_generator_stopped(self):
         x = X(self.app)
 
         def Gen():
-            raise StopIteration()
-            yield
+            if 0:
+                yield
         gen = Gen()
         x.hub.add_writer(6, gen)
         x.hub.on_tick.add(x.close_then_error(Mock(name='tick'), 2))