Python and learning programming

Aug 15, 2014 6 Replies
R

What version of Python comes with the Pi? I'm currently restarting programm ing using Python 3 on my craptop, and the book I've bought (called "Program ming for absolute beginners" or the like; it's been a long time since I did any programming, and I've never used an object-oriented language, except D elphi which is a Von Neumann language (Pascal) with an OO layer slapped on top of it) sadly turned out to be for an earlier version of Python, so the very first example gave a syntax error.



So, does the Pi come with an earlier Python, or will I have to get another book?


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M

Raspbian comes with both Python 2.x and Python 3.x. You get to choose. :)

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D

On Fri, 15 Aug 2014 04:49:33 -0700 (PDT), Robert Baker declaimed the following:

The version will likely depend upon the distribution of the OS being installed (there are a few different OS variations). Most likely it will be something in the 2.5-2.7 style (I'd hope not as far back as a 2.4).

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Without seeing your code sample it is hard to tell if you were using

2.x on a 3.x, or a 3.x on a 2.x -- in 2.x, "print" is a language statement (no parens needed; but usually not harmful either) while in 3.x it has become a library function (so what is to be printed needs to have parens around it).
Wulfraed Dennis Lee Bieber AF6VN wlfraed@ix.netcom.com HTTP://wlfraed.home.netcom.com/
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D

The Raspbian OS (the one most commonly used with the Pi) comes with both Python 2.7 and Python 3.2 installed.

The "python" and "idle" commands are used for Python 2.

The "python3" and "idle3" commands are used for Python 3.

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H

Type python to a shell. On startup, it tells you the version info.

On my system:

murray@pi1:~$ python Python 2.7.3 (default, Mar 18 2014, 05:13:23) [GCC 4.6.3] on linux2 Type "help", "copyright", "credits" or "license" for more information.

There are commands for python2 and python3. Python (without a 2 or 3) gets you the one your distro picks.

murray@pi1:~$ python3 Python 3.2.3 (default, Mar 1 2013, 11:53:50) [GCC 4.6.3] on linux2 Type "help", "copyright", "credits" or "license" for more information.

murray@pi1:~$ python2 Python 2.7.3 (default, Mar 18 2014, 05:13:23) [GCC 4.6.3] on linux2 Type "help", "copyright", "credits" or "license" for more information.

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D

I recently decided to try to switch to Python 3, but I found that there's still problems with tools and libraries, so I gave up and decided to wait another couple of years.

I'd recommend using your book and learn Python 2 for now. There aren't _that_ many differences with Python 3, so it wouldn't be too much trouble to switch at a later date.

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I

An examination of archive.raspbian.org shows these versions of python available: 2.6, 2.7, 3.2, 3.3, and 3.4.

Source:

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Consulting Minister for Consultants, DNRC I can please only one person per day. Today is not your day. Tomorrow isn't looking good, either. I am BOFH. Resistance is futile. Your network will be assimilated.
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