一个非常简单的代码，但TypeError：'int'对象不可迭代

I'm in the process of writing one of my first programs and receiving an error when testing it . Below is the snippet of code at the beginning of my program that's first throwing the issue.I have changed something, it works,thanks @jmcnamara, but i want to show the chart of erreur,from 1 to 100. But i can't arrive.I'm in the process of writing one of my first p