摘要： def print_all(x,y,z): print(z(x)+z(y)) print_all(3,3,get) 60 higher-order function: define: at least satisify one in two condition .accept one or more 阅读全文

摘要： content will be learn: how to use set. set is a object ,characters :not be repetitive,can be hashing. startup in two way : set () can be add and delet 阅读全文