From 25d6810517ac8580950a09c7cb04ff4e3fb3c796 Mon Sep 17 00:00:00 2001
From: Daniel Hahler <git@thequod.de>
Date: Fri, 21 May 2021 13:22:18 +0200
Subject: [PATCH] build(deps): require "attrs<21" on Python 3.4

Ref: https://github.com/python-attrs/attrs/pull/807
---
 setup.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/setup.py b/setup.py
index a56a440ce20..78446835748 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,9 @@
     "py>=1.5.0",
     "six>=1.10.0",
     "packaging",
-    "attrs>=17.4.0",
+    # attrs 21.1.0 is broken on Python 3.4, but not marked as such.
+    'attrs>=17.4.0,<21;python_version=="3.4"',
+    'attrs>=17.4.0;python_version>="3.5"',
     'more-itertools>=4.0.0,<6.0.0;python_version<="2.7"',
     'more-itertools>=4.0.0;python_version>"2.7"',
     "atomicwrites>=1.0",