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Are there any guidelines available for beginning Python with Python 2.6 to write applications easily migratable to Python 3 in future?

Answer 1

+1 A:

The full correct answer is in the comments, of course - but if you only do one thing to prepare for Python 3, make it learning to use parentheses with 'print'.

Python 2.x:

print 'Hello, World!'

Python 3.x:

print('Hello, World!')

It's the number one most common error in my code when I try to write Python 3.

(And since both methods work with 2.x, you might as well go ahead and get used to using the parens!)

Rini 2010-05-24 14:32:41

If you want to use print as a function (with parentheses) rather than as a statement (without parentheses) in Python 2.6 or earlier, you'll need to add this at the beginning of each module/file: `from __future__ import print_function`

blokeley 2010-05-24 17:13:39

Actually, I believe it works fine as long as you are printing single values. It is only when printing multiple (comma-separated) values that the meaning of parentheses changes between Python 2 and 3. See http://www.python.org/dev/peps/pep-3105/#backwards-compatibility for full details.

Rini 2010-05-24 21:50:41

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Are there any guidelines available for beginning Python with Python 2.6 to write applications easily migratable to Python 3 in future?

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