Tuple declaration in Python

Question

In python, one can declare a tuple explicitly with parenthesis as such:

>>> x = (0.25, 0.25, 0.25, 0.25)
>>> x
(0.25, 0.25, 0.25, 0.25)
>>> type(x)
<type 'tuple'>

Alternatively, without parenthesis, python automatically packs its into a immutable tuple:

>>> x = 0.25, 0.25, 0.25, 0.25
>>> x
(0.25, 0.25, 0.25, 0.25)
>>> type(x)
<type 'tuple'>

Is there a pythonic style to declare a tuple? If so, please also reference the relevant PEP or link.

There's no difference in the "end-product" of achieving the tuple but is there a difference in how the tuple with and without parenthesis are initialized (in CPython)?

Answer 1

From practical point of view it's best to always use parenthesis as it contributes to readability of your code. As one of the import this moto says:

"Explicit is better then implicit."

Also remember, that when defining one-tuple you need a comma: one_tuple = (15, ).