4 ms·

It's the comma that determines an expression as a tuple, not the parentheseis.

• lucian1900 12y ago
  Which is the source of the original problem, which I've also encountered myself.
• yeukhon 12y ago
  That syntax reminds me of trying to do the following print x, print y But I generall find myself doing the , in the situation like (element1,) to create a new tuple.
• herge 12y ago
  Not all the time. x = , causes a syntax error, while x = (,) creates an empty tuple.
  • dalke 12y ago
    Under both Python 2.7 and Python 3.3 I get: >>> x=(,) File "<stdin>", line 1 x=(,) ^ SyntaxError: invalid syntax
    • Spittie 12y ago
      From the Python docs (https://docs.python.org/3/tutorial/datastructures.html#tuples-and-sequences https://docs.python.org/3/tutorial/datastructures.html#tuple...) > Empty tuples are constructed by an empty pair of parentheses; And it works fine >>> x = () >>> x () I guess Herge mean that? After all, his argument was that a tuple is not always defined by the comma.
      • dalke 12y ago
        That's a reasonable deduction. Thanks!
      • hmsimha 12y ago
        There's also the distinction between x = (3) and x = (3,)