Python: declare a tuple containing 0 or 1 items

Question

How to declare a tuple containing 0 or 1 items?

Answer 1

To declare a tuple containing 0 items, use an empty pair of parentheses.

To declare a tuple containing 1 item, put a comma after a value.

E.g.

>>> a=()
>>> b='test',    # note trailing comma
>>> len(a)
0
>>> len(b)
1