TST: open temporary file as text (not binary)

tacaswell · tacaswell · commit c7ec9d1a4990 · 2018-11-02T11:46:09.000-04:00
diff --git a/lib/matplotlib/tests/test_backend_nbagg.py b/lib/matplotlib/tests/test_backend_nbagg.py
@@ -13,7 +13,8 @@ def _notebook_run(nb_file):
     """Execute a notebook via nbconvert and collect output.
        :returns (parsed nb object, execution errors)
     """
-    with tempfile.NamedTemporaryFile(suffix=".ipynb") as fout:
+    with tempfile.NamedTemporaryFile(suffix=".ipynb",
+                                     mode='w+t') as fout:
         args = ["jupyter", "nbconvert", "--to", "notebook", "--execute",
           "--ExecutePreprocessor.timeout=500",
           "--output", fout.name, nb_file]
