In this chapter, we introduced two major Python programming paradigms: creating, reading, and writing files using Python while also storing data into these files and plotting sensor values and updating plots in real time. We also explored methods to store and plot real-time Arduino sensor data. Besides helping you in your Arduino projects, these methods can also be used in your everyday Python projects. Throughout the chapter, using simple exercises, we interfaced the newly learned CSV and matplotlib modules with the Tkinter and pyFirmata modules that we learned in the previous chapters. In the next chapter, you will be introduced to your second project—a portable unit that measures and displays environmental data such as temperature, humidity, and ambient light. We will be utilizing the concepts that we have learned so far to build this project.