when starting jupyter notebook (which depends on nbconvert), the following error occurs: [E 00:35:25.170 NotebookApp] Uncaught exception GET /notebooks/examples.ipynb?token=0ca183a93fdde5cc291a9a8f882a319666998f7be03a848e (::1) HTTPServerRequest(protocol='http', host='localhost:8888', method='GET', uri='/notebooks/examples.ipynb?token=0ca183a93fdde5cc291a9a8f882a319666998f7be03a848e', version='HTTP/1.1', remote_ip='::1') Traceback (most recent call last): File "/usr/lib64/python3.6/site-packages/tornado/web.py", line 1701, in _execute result = method(*self.path_args, **self.path_kwargs) File "/usr/lib64/python3.6/site-packages/tornado/web.py", line 3178, in wrapper return method(self, *args, **kwargs) File "/usr/lib64/python3.6/site-packages/notebook/notebook/handlers.py", line 59, in get get_custom_frontend_exporters=get_custom_frontend_exporters File "/usr/lib64/python3.6/site-packages/notebook/base/handlers.py", line 519, in render_template return template.render(**ns) File "/usr/lib64/python3.6/site-packages/jinja2/environment.py", line 1090, in render self.environment.handle_exception() File "/usr/lib64/python3.6/site-packages/jinja2/environment.py", line 832, in handle_exception reraise(*rewrite_traceback_stack(source=source)) File "/usr/lib64/python3.6/site-packages/jinja2/_compat.py", line 28, in reraise raise value.with_traceback(tb) File "/usr/lib64/python3.6/site-packages/notebook/templates/notebook.html", line 1, in top-level template code {% extends "page.html" %} File "/usr/lib64/python3.6/site-packages/notebook/templates/page.html", line 153, in top-level template code File "/usr/lib64/python3.6/site-packages/notebook/templates/notebook.html", line 120, in block "header" {% for exporter in get_custom_frontend_exporters() %} File "/usr/lib64/python3.6/site-packages/notebook/notebook/handlers.py", line 19, in get_custom_frontend_exporters from nbconvert.exporters.base import get_export_names, get_exporter File "/usr/lib64/python3.6/site-packages/nbconvert/__init__.py", line 7, in <module> from . import postprocessors File "/usr/lib64/python3.6/site-packages/nbconvert/postprocessors/__init__.py", line 5, in <module> from .serve import ServePostProcessor File "/usr/lib64/python3.6/site-packages/nbconvert/postprocessors/serve.py", line 18, in <module> class ProxyHandler(web.RequestHandler): File "/usr/lib64/python3.6/site-packages/nbconvert/postprocessors/serve.py", line 20, in ProxyHandler @web.asynchronous AttributeError: module 'tornado.web' has no attribute 'asynchronous' This is because the asynchronous decorator has been removed in Tornado 6.0[1], and the ebuild has only lower Tornado version bound[2], which allows the newer incompatible Tornado version to be installed. I'll send a pull request fixing it shortly. [1] https://www.tornadoweb.org/en/stable/releases/v6.0.0.html#tornado-web Reproducible: Always
[2] https://github.com/gentoo/gentoo/blob/f9dc53ec3d9926ea797a7937e5f72577b2cd189c/dev-python/nbconvert/nbconvert-5.2.1.ebuild#L30 It doesn't even have a lower bound. I confused with the setup.py[3]. [3] https://github.com/jupyter/nbconvert/blob/5.2.1/setup.py#L204
dev-python/nbconvert-5.2.1 has been since removed from the portage tree, and the minimum available version is nbconvert-5.6.1, which fixed their code to not depend on deprecated @tornado.web.asynchronous[1]. [1] https://github.com/jupyter/nbconvert/blob/5.6.1/nbconvert/postprocessors/serve.py
