From a1e19d96a8bd6a4cfb44c88f42f0d8e0415998ac Mon Sep 17 00:00:00 2001
From: Bob Green <rgreen@aquent.com>
Date: Thu, 20 Oct 2022 07:23:39 -0400
Subject: [PATCH] Revert "pyupgrade --py37-plus **/*.py"

This reverts commit 12f8cbeaedb8d726a990657540500ecd12b1fef6.

This commit introduced a series of unit test failures, although
I'm not completely sure why.
---
 backoff/__init__.py         | 1 +
 backoff/_async.py           | 1 +
 backoff/_common.py          | 2 ++
 backoff/_decorator.py       | 1 +
 backoff/_jitter.py          | 2 ++
 backoff/_sync.py            | 1 +
 backoff/_typing.py          | 1 +
 backoff/_wait_gen.py        | 5 ++++-
 backoff/types.py            | 1 +
 tests/common.py             | 1 +
 tests/test_backoff.py       | 1 +
 tests/test_backoff_async.py | 2 ++
 tests/test_jitter.py        | 1 +
 tests/test_types.py         | 2 ++
 tests/test_wait_gen.py      | 1 +
 15 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/backoff/__init__.py b/backoff/__init__.py
index 6ce4098..196274d 100644
--- a/backoff/__init__.py
+++ b/backoff/__init__.py
@@ -1,3 +1,4 @@
+# coding:utf-8
 """
 Function decoration for backoff and retry
 
diff --git a/backoff/_async.py b/backoff/_async.py
index 167dc3a..82fd477 100644
--- a/backoff/_async.py
+++ b/backoff/_async.py
@@ -1,3 +1,4 @@
+# coding:utf-8
 import datetime
 import functools
 import asyncio
diff --git a/backoff/_common.py b/backoff/_common.py
index 52e45bb..2b2e54e 100644
--- a/backoff/_common.py
+++ b/backoff/_common.py
@@ -1,3 +1,5 @@
+# coding:utf-8
+
 import functools
 import logging
 import sys
diff --git a/backoff/_decorator.py b/backoff/_decorator.py
index 2fe3352..92dee1b 100644
--- a/backoff/_decorator.py
+++ b/backoff/_decorator.py
@@ -1,3 +1,4 @@
+# coding:utf-8
 import asyncio
 import logging
 import operator
diff --git a/backoff/_jitter.py b/backoff/_jitter.py
index 758d2a9..be7e389 100644
--- a/backoff/_jitter.py
+++ b/backoff/_jitter.py
@@ -1,3 +1,5 @@
+# coding:utf-8
+
 import random
 
 
diff --git a/backoff/_sync.py b/backoff/_sync.py
index 2904a97..4371e16 100644
--- a/backoff/_sync.py
+++ b/backoff/_sync.py
@@ -1,3 +1,4 @@
+# coding:utf-8
 import datetime
 import functools
 import time
diff --git a/backoff/_typing.py b/backoff/_typing.py
index 08f05da..20446d4 100644
--- a/backoff/_typing.py
+++ b/backoff/_typing.py
@@ -1,3 +1,4 @@
+# coding:utf-8
 import logging
 import sys
 from typing import (Any, Callable, Coroutine, Dict, Generator, Sequence, Tuple,
diff --git a/backoff/_wait_gen.py b/backoff/_wait_gen.py
index df85d44..cc9c885 100644
--- a/backoff/_wait_gen.py
+++ b/backoff/_wait_gen.py
@@ -1,3 +1,5 @@
+# coding:utf-8
+
 import itertools
 from typing import Any, Callable, Generator, Iterable, Optional, Union
 
@@ -66,7 +68,8 @@ def constant(
     except TypeError:
         itr = itertools.repeat(interval)  # type: ignore
 
-    yield from itr
+    for val in itr:
+        yield val
 
 
 def runtime(
diff --git a/backoff/types.py b/backoff/types.py
index 39b9337..25f20a4 100644
--- a/backoff/types.py
+++ b/backoff/types.py
@@ -1,3 +1,4 @@
+# coding:utf-8
 from ._typing import Details
 
 __all__ = [
diff --git a/tests/common.py b/tests/common.py
index e9244f3..56c2a8d 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -1,3 +1,4 @@
+# coding:utf-8
 import collections
 import functools
 
diff --git a/tests/test_backoff.py b/tests/test_backoff.py
index 883aaf3..cd33b63 100644
--- a/tests/test_backoff.py
+++ b/tests/test_backoff.py
@@ -1,3 +1,4 @@
+# coding:utf-8
 import datetime
 import itertools
 import logging
diff --git a/tests/test_backoff_async.py b/tests/test_backoff_async.py
index 732a64e..226ef08 100644
--- a/tests/test_backoff_async.py
+++ b/tests/test_backoff_async.py
@@ -1,3 +1,5 @@
+# coding:utf-8
+
 import asyncio  # Python 3.5 code and syntax is allowed in this file
 import random
 
diff --git a/tests/test_jitter.py b/tests/test_jitter.py
index 8193d0d..041b9fb 100644
--- a/tests/test_jitter.py
+++ b/tests/test_jitter.py
@@ -1,3 +1,4 @@
+# coding:utf-8
 import backoff
 
 
diff --git a/tests/test_types.py b/tests/test_types.py
index 7f92041..4e4b8cf 100644
--- a/tests/test_types.py
+++ b/tests/test_types.py
@@ -1,3 +1,5 @@
+# coding:utf-8
+
 from backoff.types import Details
 
 
diff --git a/tests/test_wait_gen.py b/tests/test_wait_gen.py
index 487de56..b72482d 100644
--- a/tests/test_wait_gen.py
+++ b/tests/test_wait_gen.py
@@ -1,3 +1,4 @@
+# coding:utf-8
 import backoff