Make import lazy

panel/models/__init__.py

@@ -14,7 +14,6 @@
 from .reactive_html import ReactiveHTML # noqa
 from .state import State # noqa
 from .tabulator import DataTabulator # noqa
-from .terminal import Terminal # noqa
 from .trend import TrendIndicator # noqa
 from .widgets import ( # noqa
     Audio, FileDownload, Player, Progress, SingleSelect, Video, VideoStream

panel/tests/widgets/test_base.py

@@ -5,15 +5,19 @@
 from panel.layout import Row
 from panel.links import CallbackGenerator
 from panel.widgets import (
-    CompositeWidget, Dial, FileDownload, FloatSlider, TextInput, ToggleGroup, Widget
+    CompositeWidget, Dial, FileDownload, FloatSlider, TextInput,
+    Terminal, ToggleGroup, Widget
 )
 from panel.widgets.tables import BaseTable
 from panel.tests.util import check_layoutable_properties
 
+excluded = (
+    BaseTable, CompositeWidget, Dial, FileDownload, ToggleGroup, Terminal
+)
+
 all_widgets = [
     w for w in param.concrete_descendents(Widget).values()
-    if not w.__name__.startswith('_') and
-    not issubclass(w, (CompositeWidget, BaseTable, FileDownload, ToggleGroup, Dial))
+    if not w.__name__.startswith('_') and not issubclass(w, excluded)
 ]
 
 @pytest.mark.parametrize('widget', all_widgets)

panel/widgets/terminal.py

@@ -14,8 +14,10 @@
 
 import param
 
+from pyviz_comms import JupyterComm
+
 from ..io.callbacks import PeriodicCallback
-from ..models import Terminal as _BkTerminal
+from ..util import lazy_load
 from .base import Widget
 
 
@@ -224,9 +226,6 @@ class Terminal(Widget):
         "write_to_console": None,
     }
 
-    # Set the Bokeh model to use
-    _widget_type = _BkTerminal
-
     def __init__(self, output=None, **params):
         params['_output'] = output = output or ""
         params['clear'] = self._clear
@@ -251,6 +250,10 @@ def write(self, __s):
         return len(self.output)
 
     def _get_model(self, doc, root=None, parent=None, comm=None):
+        if self._widget_type is None:
+            self._widget_type = lazy_load(
+                'panel.models.terminal', 'Terminal', isinstance(comm, JupyterComm)
+            )
         model = super()._get_model(doc, root, parent, comm)
         model.output = self.output
         return model