Adding the ability to control length to __format__ by WeiGodHorse · Pull Request #54 · fluentpython/example-code

Hello, I am a beginner of Python and github. I have just learned chapter 10 of Fluent Python. I noticed that in the last discussion section in chapter 10 you offered a little exercise in adding control over the length of output to the format method. I've just finished this exercise (although I feel like what I added looks jumbled) and added a few simple tests to the doctest (which may not be enough). I hope you can check whether the functions I added are correct. Meanwhile, I hope to take this opportunity to improve my python programming ability and practice the use of git and other functions. Thank you!