Merge pull request #3454 from mkcor/patch-1

Fix missing whitespaces in imshow error message.

Author: nicolaskruchten

packages/python/plotly/plotly/express/_imshow.py

@@ -510,8 +510,8 @@ def imshow(
     else:
         raise ValueError(
             "px.imshow only accepts 2D single-channel, RGB or RGBA images. "
-            "An image of shape %s was provided."
-            "Alternatively, 3- or 4-D single or multichannel datasets can be"
+            "An image of shape %s was provided. "
+            "Alternatively, 3- or 4-D single or multichannel datasets can be "
             "visualized using the `facet_col` or/and `animation_frame` arguments."
             % str(img.shape)
         )