从零开始的Python学习Episode 12——迭代器&…

a = [x*x for x in range(1,9)]
print(a)

#输出[1, 4, 9, 16, 25, 36, 49, 64]

def f(n):
    return n**3

a = [f(x) for x in range(1,9)]
print(a)

#输出[1, 8, 27, 64, 125, 216, 343, 512]

def fib(max): 
    L = []
    n, a, b = 0, 0, 1 
    while n < max: 
        L.append(b) 
        a, b = b, a + b 
        n = n + 1
    return L

class Fib(object): 
    def __init__(self, max): 
        self.max = max 
        self.n, self.a, self.b = 0, 0, 1 

    def __iter__(self): 
        return self 

    def next(self): 
        if self.n < self.max: 
            r = self.b 
            self.a, self.b = self.b, self.a + self.b 
            self.n = self.n + 1 
            return r 
        raise StopIteration()

def fib(max):
    n, a, b = 0, 0, 1
    while n < max:
        yield b
        a, b = b, a + b
        n = n + 1

for n in fib(5):
    print(n)

#输出
1
1
2
3
5

def f():
    print("ok")
    n = yield
    print(n)
    print("ok2")
    yield 2
f = f()
f.send(None)
f.send(1)
next(f)
#输出
ok
Traceback (most recent call last):
1
ok2
  File "D:/PyCharm Project/test/Starter/test2.py", line 10, in <module>
    next(f)
StopIteration