how to analyze my csv file with Toolkit

[maplejia]

I am new in python. I have a Amazon review csv file which inclue 100 reviews with date for a specifc product. Each review content as a document, e.g in file structure, reviews $ review_text is the document content. I want to extract 10 topics or other numbers from this 100 reviews. After it, I want to check each topic proportion in each review( document), then I will check about this topic proportion change with time( since each review have date information)

Can anyone help me about how to analyze this csv file?

Thank you very much!