

Serving notebooks from local directory: /home/zhaosong JupyterLab application directory is /home/zhaosong/anaconda3/share/jupyter/lab JupyterLab extension loaded from /home/zhaosong/anaconda3/lib/python3.7/site-packages/jupyterlab The port 8888 is already in use, trying another port.

: hello ipython, this is the first text file. IPython 7.2.0 - An enhanced Interactive Python. Type 'copyright', 'credits' or 'license' for more information If the target file exists, then the file content will be overridden. Then ipython will write all your input line text into the file.

You can input multiple line text, to end input text and write text to file click Esc key and then click Enter key.
