Make default renderer in jupyterlab/notebook plotly_mimetype

Author: marthacryan

plotly/io/_renderers.py

@@ -497,7 +497,7 @@ def show(fig, renderer=None, validate=True, **kwargs):
         )
 
     default_renderer = env_renderer
-elif ipython and ipython.get_ipython():
+elif ipython:
     # Try to detect environment so that we can enable a useful
     # default renderer
     if not default_renderer:
@@ -543,13 +543,19 @@ def show(fig, renderer=None, validate=True, **kwargs):
             pass
 
     # Check if we're running in ipython terminal
-    if not default_renderer and (
-        ipython.get_ipython().__class__.__name__ == "TerminalInteractiveShell"
-    ):
+    ipython_info = ipython.get_ipython()
+    shell = ipython_info.__class__.__name__
+    if not default_renderer and (shell == "TerminalInteractiveShell"):
         default_renderer = "browser"
 
+    # Check if we're running in a Jupyter notebook or JupyterLab
+    if not default_renderer and (shell == 'ZMQInteractiveShell') and (
+        type(ipython_info).__module__.startswith('ipykernel.')
+    ):
+        default_renderer = 'plotly_mimetype'
+
     # Fallback to renderer combination that will work automatically
-    # in the classic notebook, jupyterlab, nteract, vscode, and
+    # in the jupyter notebook, jupyterlab, nteract, vscode, and
     # nbconvert HTML export.
     if not default_renderer:
         default_renderer = "plotly_mimetype+notebook"