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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: I am out of trial and error again  Lists
Date: Sat, 25 Oct 2014 14:23:44 -0400
Organization: IISS Elusive Unicorn
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On Fri, 24 Oct 2014 10:38:31 -0400, Seymore4Head
<Seymore4Head@Hotmail.invalid> declaimed the following:

>
>I do get the difference.  I don't actually use Python 2.  I use
>CodeSkulptor.  I do have Python 3 installed.  Actually I have Python 2
>installed but IDLE defaults to Python 3.  So it is a pain to actually
>load Python 2.
>

	So don't use Idle... Open up a Windows command shell and invoke Python
without giving a script file to execute.

C:\Users\Wulfraed\Documents>python
ActivePython 2.7.5.6 (ActiveState Software Inc.) based on
Python 2.7.5 (default, Sep 16 2013, 23:11:01) [MSC v.1500 64 bit (AMD64)]
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()

C:\Users\Wulfraed\Documents>python3
ActivePython 3.3.2.0 (ActiveState Software Inc.) based on
Python 3.3.2 (default, Sep 16 2013, 23:11:39) [MSC v.1600 64 bit (AMD64)]
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()

C:\Users\Wulfraed\Documents>

	Note that my default Python is still 2.7, but I also have Python 3.3
installed, and can access it using "python3" (I can also ensure Python 2.7
by using "python2")


>
>I tried list(range(10)  I thought that would work in Python 3.  It
>didn't.  I spent quite a bit of time last night trying to come up with

	Really? what did it do? SHOW US!

C:\Users\Wulfraed\Documents>python3
ActivePython 3.3.2.0 (ActiveState Software Inc.) based on
Python 3.3.2 (default, Sep 16 2013, 23:11:39) [MSC v.1600 64 bit (AMD64)]
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> list(range(10))
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> print(list(range(10)))
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> repr(list(range(10)))
'[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]'
>>>

	Recall that "print" is a function in Python 3, so the extra layer of ()
are required.

C:\Users\Wulfraed\Documents>python
ActivePython 2.7.5.6 (ActiveState Software Inc.) based on
Python 2.7.5 (default, Sep 16 2013, 23:11:01) [MSC v.1500 64 bit (AMD64)]
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> list(range(10))
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> print list(range(10))
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> print(list(range(10)))
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> repr(list(range(10)))
'[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]'
>>>

	"Print" doesn't need the (), but they also don't hurt it in Python 2.
(still in Py2)

>>> range(10)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> xrange(10)
xrange(10)
>>> print range(10)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> print xrange(10)
xrange(10)
>>> exit
Use exit() or Ctrl-Z plus Return to exit
>>> exit()

	Now Py3

C:\Users\Wulfraed\Documents>python3
ActivePython 3.3.2.0 (ActiveState Software Inc.) based on
Python 3.3.2 (default, Sep 16 2013, 23:11:39) [MSC v.1600 64 bit (AMD64)]
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> range(10)
range(0, 10)
>>> xrange(10)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'xrange' is not defined
>>> print(range(10))
range(0, 10)
>>>
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/