adding decode for py3 compat 😎

can you tell i’m a py2 coder? I

Author: andrewgiessel

folium/folium.py

@@ -1012,7 +1012,7 @@ def image_overlay(self, data, opacity=0.25, min_lat=-90.0, max_lat=90.0,
             with open(filename, 'wb') as fd:
                 fd.write(png_str)
         else:
-            filename = "data:image/png;base64,"+base64.b64encode(png_str)
+            filename = "data:image/png;base64,"+base64.b64encode(png_str).decode('utf-8')
 
         if image_name not in self.added_layers:
             if image_name is None:

tests/folium_tests.py

@@ -491,7 +491,7 @@ def test_image_overlay(self):
         png_str = write_png(data)
         with open('data.png', 'wb') as f:
             f.write(png_str)
-        inline_image_url = "data:image/png;base64,"+base64.b64encode(png_str)
+        inline_image_url = "data:image/png;base64,"+base64.b64encode(png_str).decode('utf-8')
 
         image_tpl = self.env.get_template('image_layer.js')
         image_name = 'Image_Overlay'