Question

我一直收到错误：“UnboundLocalError：在分配之前引用的局部变量'Pitch'有没有办法解决这个问题？

import winsound, random

Pitch = random.randint(1000, 10000)
Duration = random.randint(100, 500)

def random():
    winsound.Beep(Pitch, Duration)
    Pitch = random.randint(1000, 10000)
    Duration = random.randint(100, 500)
    winsound.Beep(Pitch, Duration)
    Pitch = random.randint(1000, 10000)
    Duration = random.randint(100, 500)
    winsound.Beep(Pitch, Duration)
    Pitch = random.randint(1000, 10000)
    Duration = random.randint(100, 500)
    winsound.Beep(Pitch, Duration)
    Pitch = random.randint(1000, 10000)
    Duration = random.randint(100, 500)
    winsound.Beep(Pitch, Duration)

random()

Answer 1

Pitch行中的Duration和winsound.Beep(Pitch, Duration)变量尚未定义。它们与全局范围内的同名变量不同。

为了通知口译员您的Pitch和Duration变量与全局范围中定义的变量相同，您需要在函数中使用global关键字：< / p>

def random():
    global Pitch, Duration    # <<--- this resolves your scoping issue
    winsound.Beep(Pitch, Duration)
    Pitch = random.randint(1000, 10000)

此外，您应该 defintely 重命名您的函数，并避免使用与Python库中相同的名称命名您的函数。

Answer 2

使用global：

def random():
    global Pitch, Duration
    ...

但请注意，您可以使用函数random重新定义模块random()。

请将该功能重命名为random_func()

您也可以使用循环：

import winsound, random

def rand_func():
    for _ in range(5):
        Pitch = random.randint(1000, 10000)
        Duration = random.randint(100, 500)
        winsound.Beep(Pitch, Duration)

rand_func()

Python：UnboundLocalError：赋值前引用的局部变量'n'

2 个答案: