相关疑难解决方法(0)

可以在Python中创建无限的嵌套列表.这很清楚,虽然不受欢迎,但绝对没用,这是一个众所周知的事实.

>>> a = [0]
>>> a[0] = a
>>> a
[[...]]
>>> a[0] == a
True

我的问题是,这里发生了什么:

>>> a = [0]
>>> b = [0]
>>> a[0], b[0] = b, a
>>> a
[[[...]]]
>>> b
[[[...]]]
>>> a == b
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: maximum recursion depth exceeded in cmp
>>> a[0] == b
True
>>> a[0][0] == b
Traceback (most recent call last):
  File "<stdin>", line 1, in <module> …