Confusing […] List in Python: What is it?

Question

So I was writing up a simple binary tree in Python and came across [...]

I don\'t believe this to be related to the Ellipsis object, more it seems to have something

Answer 1

If you would have used a PrettyPrinter, the output would had been self explanatory

>>> l = [1,2,3,4]
>>> l[0]=l
>>> l
[[...], 2, 3, 4]
>>> pp = pprint.PrettyPrinter(indent = 4)
>>> pp.pprint(l)
[, 2, 3, 4]
>>> id(l)
70327632

In other words its something like