python中的無限Fibonacci生成器，產量誤差？

Question

def fib_gen():
    a, b = 0, 1
    while True:
        yield a
        a, b = b, a + b

print(next(fib_gen())) 
print(next(fib_gen())) 
print(next(fib_gen())) 
print(next(fib_gen()))

Output: 0 
        0 
        0 
        0

我試圖在python中創建一個無限的Fibonacci生成器。 請幫忙......我哪里做錯了？

Answer 1

每次調用fib_gen()都會創建一個處於初始狀態的新生成器。 嘗試將fib_gen()的返回值fib_gen()變量並在同一個變量上調用next() 。

Answer 2

首先需要創建一個生成器對象：

def fib_gen():
    a, b = 0, 1
    while True:
        yield a
        a, b = b, a + b


generator = fib_gen()

print(next(generator))
print(next(generator))
print(next(generator))
print(next(generator))

輸出是：

0
1
1
2