用于构建工程计算和图形输出的网站的最佳和最新工具和编程语言

I have written a Python application that takes about 4 numbers from the user and does some calculations with it. The final result is displayed on a matplotlib graph. Now, I would like to take this application and put it on a web site. I want to have users sign up for a yearly subscription, do their calculations and print the results to a PDF to be saved on their computer. Because I know Python (but just a beginner at that), I tried to learn Django, but I hit many road blocks with Python version management, getting bunch of error messages that I could not debug. My question to you is what current tools and programming language would you recommend (Java, PHP, HTML, others). I am willing to learn and try anything. I'd rather be able to look at others' code to understand what they did and how they did. Thank you.I have written a Python application that takes