From f9c9ca794ef19cfcc38d5e4b57b89fde178b61cf Mon Sep 17 00:00:00 2001
From: Takafumi Arakaki <aka.tkf@gmail.com>
Date: Thu, 30 Aug 2018 19:15:36 -0700
Subject: [PATCH] Don't try to re-setup any GUI event loop

---
 src/init.jl | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/init.jl b/src/init.jl
index b564d9c3..b595e556 100644
--- a/src/init.jl
+++ b/src/init.jl
@@ -70,6 +70,14 @@ function find_backend(matplotlib::PyObject)
 
     qt2gui = Dict("pyqt5"=>:qt_pyqt5, "pyqt4"=>:qt_pyqt4, "pyside"=>:qt_pyside)
 
+    if haskey(matplotlib, :pyplot)
+        # If matplotlib.pyplot exists, it means that matplotlib
+        # backend is already configured.  It may mean that PyPlot.jl
+        # is called via PyJulia.
+        backend = lowercase(matplotlib[:get_backend]())
+        return (backend, get(matplotlib2gui, backend, :none))
+    end
+
     rcParams = PyDict(matplotlib["rcParams"])
     default = lowercase(get(ENV, "MPLBACKEND",
                             getnone(rcParams, "backend", "none")))