Auto detect Spyder and enable SVG renderer

Author: jonmmease

Diff for: packages/python/plotly/plotly/io/_renderers.py

@@ -471,10 +471,21 @@ def show(fig, renderer=None, validate=True, **kwargs):
     if not default_renderer and "VSCODE_PID" in os.environ:
         default_renderer = "vscode"
 
-    # Cheick if we're running in nteract
+    # Check if we're running in nteract
     if not default_renderer and "NTERACT_EXE" in os.environ:
         default_renderer = "nteract"
 
+    # Check if we're running in spyder and orca is installed
+    if not default_renderer and "SPYDER_ARGS" in os.environ:
+        try:
+            from plotly.io.orca import validate_executable
+
+            validate_executable()
+            default_renderer = "svg"
+        except ValueError:
+            # orca not found
+            pass
+
     # Fallback to renderer combination that will work automatically
     # in the classic notebook (offline), jupyterlab, nteract, vscode, and
     # nbconvert HTML export.