摘要： 1. Use set() function to show only unique elements. And we can add() and remove() in a set. Also, it is allowed to use list() to change set into a lis 阅读全文

摘要： 1. Global scope value can not be changed in function. 2. We can define a global variable in a function by using global. 3. Rules of using variable: Fi 阅读全文