Printed a list, three dots appeared inside sublists

by

Probably you accidentally built a list containing a reference to itself (or here, lots of references):

>>> a = ['x']
>>> a
['x']
>>> a[0] = a
>>> a
[[...]]

The three dots are used so that the string representation doesn’t drown in recursion. You can verify this by using id and the is operator:

>>> id(a)
165875500
>>> id(a[0])
165875500
>>> a is a[0]
True

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