From 897b5d153a9fc12c072f8f6d8fa07f8deec679d3 Mon Sep 17 00:00:00 2001
From: Maximilian Roos <5635139+max-sixty@users.noreply.github.com>
Date: Sat, 9 Nov 2019 16:30:32 -0500
Subject: [PATCH] remove syntax warning (#3505)

---
 xarray/plot/plot.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xarray/plot/plot.py b/xarray/plot/plot.py
index ca68f617144..5c754c3f49b 100644
--- a/xarray/plot/plot.py
+++ b/xarray/plot/plot.py
@@ -288,7 +288,7 @@ def line(
         )
 
     # The allargs dict passed to _easy_facetgrid above contains args
-    if args is ():
+    if args == ():
         args = kwargs.pop("args", ())
     else:
         assert "args" not in kwargs