Python 3.0 is out

Python 3.0 is here.

Guido and others released Python 3.0, a major “backward” incompatible python release.

It was a necessary choice to remove many old libraries, rework the std library, and change some behaviour.

You can see it all in What’s new in Python 3.0.

• The most visible change is maybe the print statement, print is now a function:

  print “toto”

becomes

print("toto")

• The % operator whis is supplented by the format() method:

  old: “Name: %s” % “john”
  new: “Name: {0}".format(“john”)
  old: “Names: %s %s” % (“John”,“Paul”)
  new: “Names: {1} {0}".format(“Paul”,“John”)
  new named: “Names: {first_name} {family_name}".format(family_name=“Dububu”, first_name=“Jacky”)

• And the new IO library, which become the standard one

A 2to3 migration module could help you for this transition.