Add support for rendering pandas styler objects (#3152)

panel/pane/markup.py

@@ -173,7 +173,7 @@ def applies(cls, obj):
         module = getattr(obj, '__module__', '')
         name = type(obj).__name__
         if (any(m in module for m in ('pandas', 'dask', 'streamz')) and
-            name in ('DataFrame', 'Series', 'Random', 'DataFrames', 'Seriess')):
+            name in ('DataFrame', 'Series', 'Random', 'DataFrames', 'Seriess', 'Styler')):
             return 0.3
         else:
             return False
@@ -215,6 +215,9 @@ def _get_properties(self):
         if hasattr(df, 'to_html'):
             if 'dask' in module:
                 html = df.to_html(max_rows=self.max_rows).replace('border="1"', '')
+            elif 'style' in module:
+                classes = ' '.join(self.classes)
+                html = df.to_html(table_attributes=f'class="{classes}"')
             else:
                 kwargs = {p: getattr(self, p) for p in self._rerender_params
                           if p not in DivPaneBase.param and p != '_object'}

panel/widgets/tables.py

@@ -915,6 +915,12 @@ class Tabulator(BaseTable):
     }
 
     def __init__(self, value=None, **params):
+        import pandas.io.formats.style
+        if isinstance(value, pandas.io.formats.style.Styler):
+            style = value
+            value = value.data
+        else:
+            style = None
         configuration = params.pop('configuration', {})
         self.style = None
         self._computed_styler = None
@@ -924,6 +930,8 @@ def __init__(self, value=None, **params):
         super().__init__(value=value, **params)
         self._configuration = configuration
         self.param.watch(self._update_children, self._content_params)
+        if style is not None:
+            self.style._todo = style._todo
 
     def _validate(self, *events):
         super()._validate(*events)
@@ -1533,4 +1541,3 @@ def on_button_click(self, callback, column=None):
         if column not in self._on_click_callbacks:
             self._on_click_callbacks[column] = []
         self._on_click_callbacks[column].append(callback)
-