How to create a tuple of an empty tuple in Python?

Question

How can I create a tuple consisting of just an empty tuple, i.e. (())? I have tried tuple(tuple()), tuple(tuple(tuple())), tuple

Answer 1

The empty tuple is () (or the more-verbose and slower tuple()), and a tuple with just one item (such as the integer 1), called a singleton (see here and here) is (1,). Therefore, the tuple containing only the empty tuple is

((),)

Here are some results showing that works:

>>> a=((),)
>>> type(a)

>>> len(a)
1
>>> a[0]
()
>>> type(a[0])

>>> len(a[0])
0