循环变量可见性/范围[重复]

Question

我正用头撞桌子，试图让你明白我做错了什么。

class Endpoint:
    PortID = 0
    MAC = ''
    IP = ''
    FQDN = ''
    __init__()...


class Interface:
    Index = 0
    Endpoints = []
    __init__()
    ...

我的主要部分：

for i in interfaces: #list of Interface objects
    for e in endpoints: #list of Endpoint objects
        is (some condidions):
            i.Endpoints.append(e)
    i.print() # prints all endpoints connected to the interface

然后在输出中我有这样的东西：

ge0/0:
  11:11:11:11:11:11
ge0/1:
  11:11:11:11:11:11
  22:22:22:22:22:22
ge0/2
  11:11:11:11:11:11
  22:22:22:22:22:22
  33:33:33:33:33:33

我打算得到的是：

ge0/0:
  11:11:11:11:11:11
ge0/1:
  22:22:22:22:22:22
ge0/2
  33:33:33:33:33:33

你明白了。这就像“i”变量不是在每次循环迭代中创建和销毁，而是只是更新。换句话说，它不是接口对象的表示，而是某种缓冲区commot 到整个循环。 我究竟做错了什么？我怎样才能达到预期的目标？

提前感谢您的帮助。

Answer 1

在你的主要功能中：

for i in interfaces: #list of Interface objects
for e in endpoints: #list of Endpoint objects
    is (some condidions):
        i.Endpoints.append(e)
    i.print() # prints all endpoints connected to the interface

你没有清除之前的 i 值

在打印后添加i = 0（或任何清除i值的语句），如下：

for i in interfaces: #list of Interface objects
    for e in endpoints: #list of Endpoint objects
        is (some condidions):
            i.Endpoints.append(e)
    i.print() # prints all endpoints connected to the interface
    i = 0