[Python-Dev] Replacement for print in Python 3.0
steve at holdenweb.com
Fri Sep 2 06:30:42 CEST 2005
Steven Bethard wrote:
> [Guido van Rossum]
>>And good riddance! The print statement harks back to ABC and even
>>(unvisual) Basic. Out with it!
> [Barry Warsaw]
>>I have to strongly disagree. The print statement is simple, easy to
>>understand, and easy to use.
> [Paul Moore]
>>I agree with Barry. In particular, the behaviour of adding spaces
>>between items is something I find very useful, and it's missing from
>>the functional forms.
... as proposed, but ...
> While I agree that mostly the print statement is "simple, easy to
> understand, and easy to use", I've seen the trailing-comma version
> cause confusion for a lot of newbies. I wouldn't mind at all if the
> trailing-comma version disappeared in Python 3.0 -- if you need this
> kind of complicated output, you can always use sys.stdout.write and/or
> string formatting.
... the trailing-comma version is indeed BASIC voodoo of ancient
heritage, and not something I'd personally miss.
> The spaces-between-items point that Paul Moore makes is IMHO the best
> argument against the proposed write*() functions. I think we *do*
> need a statement or function of some sort that does the most basic
> task: writing a line to sys.stdout that calls str() on each of the
> elements and joins them with spaces. That is, I think we need to keep
> *something* with functionality like:
> def XXX(*args):
> sys.stdout.write('%s\n' % ' '.join(str(a) for a in args))
> Note that this would keep the Hello World example simple:
> XXX(greeting, name)
Of course, for Python 3.0 if we lose the keyword there's nothing to stop
us calling the convenience function "print". With the removal of the
trailing-comma functionality we'd only have to add parentheses to 2.X
print statements to have them work :-)
Next question: could the function have a sensible return value, or is
None the best possible result?
hesitating-to-suggest-minus-one-ly y'rs - steve
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC http://www.holdenweb.com/
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