[Python-Dev] Issue #26204: compiler now emits a SyntaxWarning on constant statement (original) (raw)

Chris Barker chris.barker at noaa.gov
Mon Feb 8 18:21:47 EST 2016

On Mon, Feb 8, 2016 at 1:51 PM, Victor Stinner <victor.stinner at gmail.com> wrote:

I didn't know. I just checked. It's assert used with a non-empty tuple:

>>> assert ("tuple",)

which is more interesting with a tuple without the parentheses:

t = In [4]: t = True,

In [5]: t

Out[5]: (True,)

works fine, but not if you use an assert:

In [7]: assert True,

File "", line 1

assert True,

            ^

SyntaxError: invalid syntax I actually like the Warning with the note about the problem better:

:1: SyntaxWarning: assertion is always true, perhaps remove

parentheses?

And, of course, more relevant with something Falsey in the tuple:

In [14]: assert (False,)

:1: SyntaxWarning: assertion is always true, perhaps remove parentheses?

assert (False,)

But I am curious why you get a different error without the parens?

-CHB

--

Christopher Barker, Ph.D. Oceanographer

Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception

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