[Ironpython-users] Warn user when using old print syntax

Dino Viehland dinov at microsoft.com
Tue Oct 11 20:53:27 CEST 2011


So you want to warn if the file contains a print statement w/o from __future__ import print_function?  What if it's a call to print such as print('foo')  which is valid in both 2.x and 3.x?

Either way you should be able to just update ParsePrintStmt in Parser.cs.    But dealing w/ the case of the parens would be a little more difficult - but I think you can just peek at the next token after print and see if it's a parenthesis right after we eat the print keyword.  

-----Original Message-----
From: Jeff Hardy [mailto:jdhardy at gmail.com] 
Sent: Tuesday, October 11, 2011 9:26 AM
To: Markus Schaber; Dino Viehland
Cc: ironpython-users at python.org
Subject: Re: [Ironpython-users] Warn user when using old print syntax

I think you'd have to patch the code to add the print check to the -3 warnings. Dino might be able to point out where you would do that.

- Jeff

On Tue, Oct 11, 2011 at 9:13 AM, Markus Schaber <m.schaber at 3s-software.com> wrote:
> Hi,
>
> What is the easiest way to detect and warn the user when he uses the old print syntax?
>
> It seems that "-3" aka "WarnPy3k" does not warn about it, and a simple check whether the user does "from __future__ import print_function" gives false positives if the user does not print at all.
>
> Thanks!
>
> Best regards
>
> Markus Schaber
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