A new notebook tab will open in your default web browser. From the IPython Notebook interface click the New Notebook button. Instead use jupyter notebook to start Jupyter. Tell us what you tried in steps 1-3 above. ipython notebook -pylab The -pylab option was removed when they transitioned from IPython to Jupyter notebook. If you can still reproduce the issue in steps 1 and 2, and can not reproduce the issue in step 3, collect relevant server and javascript error messages, your jupyterlab and notebook versions (along with version numbers of any other relevant packages), screenshots or short screencasts illustrating the problem, and post an issue.If you can, this points to a problem that is outside of JupyterLab, such as a problem with the kernel, the notebook server, etc. In order to run, the adopted scheme is shift + enter. Sometimes the line continuation character is automatically added after pressing the Enter key, and sometimes it is run after pressing the Enter key.
Try to reproduce the issue in the classic notebook (make sure to launch it from the JupyterLab help menu). Copy the code from elsewhere and paste it into the Ipython Console to run it.We've had issues before where a browser extension was changing the page under JupyterLab, creating very unpredictable problems. Try to reproduce the issue after turning off chrome or firefox browser extensions, particularly browser extensions that modify webpages.This checks to see if the issue has been fixed in the current JupyterLab, or if the issue comes from an extension, not JupyterLab itself. If you are using conda, create a new environment with conda create -n jlab-test -c conda-forge jupyterlab and activate the environment with conda activate jlab-test, then start jupyter lab. In a new environment with just the latest JupyterLab installed.If you are having this issue, please see if you can reproduce it: If you are saying that this is also a problem with classic notebook, that indicates this is not a problem with JupyterLab. Also using the regular notebook interface