Dear Sir/ Madam,
I'm expert in Python for statistical data analysis, machine learning, deep learning & data science. I have hands on experience on a lot of Python libraries such as Numpy, Scipy, Pandas data frames, ScikitLearn, Pytorch, Keras to do your task.
I have referred to this StackOverFlow link. As you said there are so many null(NA) values in your data set corresponding to tot_assets variable column. Lets predict or interpolate them with a best accuracy.
Thank you for your time and consideration.
Please contact through in box anytime to discuss the project details.
With best regard,
Dilruksha Rajapaksha.