eryksun added the comment: Refer to section 6.2.3, parenthesized forms:
https://docs.python.org/3/reference/expressions.html#parenthesized-forms if the list contains at least one comma, it yields a tuple; otherwise, it yields the single expression that makes up the expression list. So (2) is an int, while (2,) is a tuple that contains an int. The exception is the empty tuple, for which parentheses are required — allowing unparenthesized “nothing” in expressions would cause ambiguities and allow common typos to pass uncaught. Thus () is an empty tuple. Note also that section 6.13 states the following regarding a trailing comma: The trailing comma is required only to create a single tuple (a.k.a. a singleton); it is optional in all other cases. ---------- nosy: +eryksun resolution: -> not a bug stage: -> resolved status: open -> closed _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue24901> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
