Question

我试图通过coroutines运算符来理解python中的yield。

def minimize():
    current = yield
    while True:
        value = yield current
        current = min(value, current)

我有函数minimize()，它返回已经发送到函数的所有值的最小值。

it = minimize()
next(it)        
print(it.send(10))
print(it.send(4))
print(it.send(22))
print(it.send(-1))

>>>
10
4
4
-1

我对这个功能有疑问。

current = yeild实现的目标。根据我在生成器上下文中对yield的理解，yeild在生成器对象上使用next()时返回下一个值。

Answer 1

让我们按照流程控制，缩进的项目是minimize()生成器：

it = minimize()   # Creates generator
next(it)
    current = yield       # suspends on yield (implicit None)
print(it.send(10))
    current = 10          # resumes
    while True:
        value = yield 10  # suspends on yield
# Output: 10
print(it.send(4))
        value = 4         # resumes
        current = min(4, 10)
    while True:
        current = yield 4
# Output: 4
print(it.send(22))
        value = 22
        current = min(22, 4)
    while True:
        current = yield 4
# Output: 4
print(it.send(-1))
        value = -1
        current = min(-1, 4)
    while True:
        current = yield -1
# Output: -1

使用yield的python中的协同程序

1 个答案: