From 15089886c2b261d75545bfc853d55804596fe13a Mon Sep 17 00:00:00 2001
From: Emil Hessman <emil@hessman.se>
Date: Sat, 29 Sep 2018 18:30:52 +0200
Subject: [PATCH] Avoid modifying mutable default value

Rationale: http://effbot.org/zone/default-values.htm

Signed-off-by: Emil Hessman <emil@hessman.se>
---
 compose/service.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compose/service.py b/compose/service.py
index 3327c77f8..5ae2ac3af 100644
--- a/compose/service.py
+++ b/compose/service.py
@@ -197,7 +197,9 @@ class Service(object):
     def __repr__(self):
         return '<Service: {}>'.format(self.name)
 
-    def containers(self, stopped=False, one_off=False, filters={}, labels=None):
+    def containers(self, stopped=False, one_off=False, filters=None, labels=None):
+        if filters is None:
+            filters = {}
         filters.update({'label': self.labels(one_off=one_off) + (labels or [])})
 
         result = list(filter(None, [