NameError: name 'null' is not defined

#1

Hi when I tried running py file in AWS I met the following question:

.
In py file, ‘null’ is located at:

Before I met this information, I also met that “NameError: name ‘true’ is not defined”, which I solved by changing ‘true’ to ‘True’. But it doesn’t work for the null error.
Could you please help me figure out this problem? Thank you!

#2

You can’t run ipynb file on python3 they are different. Either run Jupyter notebooks on AWS or run the python3 commands from the notebook in Python3 shell.