Ask HN: Anyone using Python 3 in production?

Re:Ask HN: Anyone using Python 3 in production? by justin_vanw on Saturday June 26, 2010 @05:01PM (#1464275)

Nobody is switching to Python 3. If you go first you get all of the pain and no advantages (plus switching later isn't very hard anwyay). I would import unicode_literals, division, and the print() function from __future__ and stick with 2.6.

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Re:Ask HN: Anyone using Python 3 in production? by endtime on Saturday June 26, 2010 @05:29PM (#1464318)

What are the benefits of print()?

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Re:Ask HN: Anyone using Python 3 in production? by samdk on Saturday June 26, 2010 @05:37PM (#1464327)

It has optional arguments which make certain things a lot easier and make it much more consistent with the rest of the language.

sep is the separator between arguments, so you can do something like:

    >> print('a','b','c',sep='')
    abc

end is the value at the end of the line (useful, for example, if you want to print without a newline at the end).

file lets you specify a file to print to, so for example you can do file=sys.stderr to print to stderr instead of stdout.

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Re:Ask HN: Anyone using Python 3 in production? by algorias on Saturday June 26, 2010 @10:38PM (#1464746)

All that is just syntactic sugar.

print "comma prevents a newline from being printed",

print >> sys.stderr, "Any file object can be used"

The change to a function is purely for consistency, not functionality.

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Re:Ask HN: Anyone using Python 3 in production? by gometro33 on Saturday June 26, 2010 @08:00PM (#1464544)

Being part of __future__, is print() slated for release in 2.7 or is it strictly a 3.x feature?

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Re:Ask HN: Anyone using Python 3 in production? by timf on Saturday June 26, 2010 @10:43PM (#1464765)

In 2.7, print is still the print statement by default:

http://docs.python.org/2.7/library/functions.html#print

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Re:Ask HN: Anyone using Python 3 in production? by algorias on Saturday June 26, 2010 @10:40PM (#1464753)

Strictly 3.0, because of backwards compatibility.

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Re:Ask HN: Anyone using Python 3 in production? by babo on Saturday June 26, 2010 @06:27PM (#1464405)

  from __future__ import print_function

  map(print, [1,2,3])

  def test(*a, **b):
    print(*a, **b)
  
  test(12)
  with open('t.out', 'w') as f:
    test(12,13, sep='--', file=f)

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