Support bytes on Image (#2963)

panel/pane/image.py

@@ -46,6 +46,12 @@ def applies(cls, obj):
                 return True
             elif isurl(obj, None):
                 return 0
+        elif isinstance(obj, bytes):
+            try:
+                cls._imgshape(obj)
+                return True
+            except Exception:
+                return False
         if hasattr(obj, 'read'):  # Check for file like object
             return True
         return False
@@ -57,6 +63,8 @@ def _data(self):
             if isfile(self.object):
                 with open(self.object, 'rb') as f:
                     return f.read()
+        elif isinstance(self.object, bytes):
+            return self.object
         if hasattr(self.object, 'read'):
             if hasattr(self.object, 'seek'):
                 self.object.seek(0)

panel/tests/pane/test_image.py

@@ -98,6 +98,14 @@ def test_loading_a_image_from_url():
     image_data = image_pane._data()
     assert b'PNG' in image_data
 
+def test_image_from_bytes():
+    path = os.path.dirname(__file__)
+    with open(os.path.join(path, '../test_data/logo.png'), 'rb') as f:
+        img = f.read()
+
+    image_pane = PNG(img)
+    image_data = image_pane._data()
+    assert b'PNG' in image_data
 
 def test_loading_a_image_from_pathlib():
     """Tests the loading of a image from a pathlib"""
@@ -107,7 +115,6 @@ def test_loading_a_image_from_pathlib():
     image_data = image_pane._data()
     assert b'PNG' in image_data
 
-
 def test_image_alt_text(document, comm):
     """Tests the loading of a image from a url"""
     url = 'https://file-examples-com.github.io/uploads/2017/10/file_example_PNG_500kB.png'