若 a = range(100),以下哪些操作是合法的?
关于range的总结
https://stackoverflow.com/questions/39241877/what-is-a-class-range
https://docs.python.org/3/library/stdtypes.html#range
ragne()返回 <class range>
它属于 built-in types, 实现了collections.abc.Sequence抽象类。支持的method有:
5 in range(10)
返回布尔值range(10)[5]
返回元素range(10)[3:7]
仍然返回range objectjust a function that return list