python_code_412

1. python :‘’and “”any differences?
2. python 可以类似 matlab 用1：n索引数组 arr[2:len(arr)] 从0计数
3. Pulling in just a single function from a module is called a function import, and it's done with the from keyword: from math import sqrt
4. a way to handpick the variables and functions we want from modules: from math import *
5. the type() function returns the type of the data it receives as an argument
6. == 与 =