python_迭代器生成器_斐波那契序列并用islice截取

#迭代器版本
class Fib:
    def __init__(self):
        self.left = 0
        self.current = 1
    def __iter__(self):
        return self
    def __next__(self):
        value = self.current
        self.left, self.current = self.current, self.current + self.left
        return value
from itertools import islice
f = Fib()
print(list(islice(f, 11, 40)))

 

 

# 生成器版本的斐波拉且数列
def fib():
    left,current = 0,1
    while True:
        yield current   # 能挂起代码，保留当前函数执行的上下文，状态
        left,current = current, current+left

f = fib()  # 35 到46