[Year 12 SofDev] Should I teach lists?

Mon Mar 7 13:47:01 AEDT 2016

Python does have an array type which is similar to what other languages define as an array. It limits the array to a specific type. It may be useable, especially to contrast with a 'list' in python to help students understand the pythonic way of doing things!

https://docs.python.org/2/library/array.html

You can use it like the following:

>>>from array import array
>>>a = array('I',[1,2,3,4])
>>>a[1]
2
>>>a.append('a')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: an integer is required (got type str)

The 'I' is the typecode which forces the array to be restricted to the type this typecode represents (int's in this case). It might be useful if you are using python and need to explain/demo arrays.

Guy Flaherty

From: sofdev-bounces at edulists.com.au [mailto:sofdev-bounces at edulists.com.au] On Behalf Of Croke, Daryl D
Sent: Monday, 7 March 2016 12:06 PM
To: Year 12 Software Development Teachers' Mailing List <sofdev at edulists.com.au>
Subject: Re: [Year 12 SofDev] Should I teach lists?

Hi all

Python doesn't do arrays as such, but you can make list within list and make them function like an array, so surely that's the point.

see: http://www.i-programmer.info/programming/python/3942-arrays-in-python.html

What are we trying to achieve? What code do we require to achieve that?

Even though we can have mixed data type lists in Python it would be best to avoid that.

Cheers

Daryl Croke

Mount Ridley College
8338 3600
http://mountridleycollege.vic.edu.au/

keep on coding
http://geekstuff.global2.vic.edu.au/
http://physicalcomputing.global2.vic.edu.au/

________________________________
From: sofdev-bounces at edulists.com.au<mailto:sofdev-bounces at edulists.com.au> [sofdev-bounces at edulists.com.au] on behalf of Laurie Savage [08327998 at pvgc.vic.edu.au]
Sent: Monday, 7 March 2016 11:30 AM
To: Year 12 Software Development Teachers' Mailing List
Subject: Re: [Year 12 SofDev] Should I teach lists?
I'm no expert here so I'm very happy to be corrected but this poses a problem with PHP and Python where arrays and lists are interchangeable. In PHP and Python arrays can contain elements of different types: e.g.

$fred = array("Fred", "Smith", 40, 78.50) so $fred[2] + $fred[3] = 118.5 but $fred[0] + $fred[1] should throw an error in PHP, not in Python.

or

$fred = array("FName"=>"Fred", SName"=>"Smith", "Age"=>40, "Weight"=> 78.5)

I seem to remember having this discussion with Kevork back in 2010!

Laurie

Laurie Savage
IT Teacher/Assessment and Reporting Coordinator
Pascoe Vale Girls College

On 7 Mar 2016, at 11:09 AM, Chris Bucknell <Chris.Bucknell at haileybury.vic.edu.au<mailto:Chris.Bucknell at haileybury.vic.edu.au>> wrote:

Hi All,

Like Damien I don't encourage my students to use List and Dictionaries because in they tend to confuse them and arrays when it comes to exams.  So I find it simpler to avoid them and get the students to understand what's on the study design and what they'll be assessed on.

Cheers

Chris Bucknell
Head of CDT; Coord, Internal Exam; House Tutor
+61 3 9904 6360
Chris.Bucknell at haileybury.vic.edu.au<mailto:%7bemail%7d>
www.haileybury.vic.edu.au<http://www.haileybury.vic.edu.au/>

From: sofdev-bounces at edulists.com.au<mailto:sofdev-bounces at edulists.com.au> [mailto:sofdev-bounces at edulists.com.au] On Behalf Of ATKINSON-BUCK, Damien
Sent: Monday, 7 March 2016 10:38 AM
To: Year 12 Software Development Teachers' Mailing List
Subject: Re: [Year 12 SofDev] Should I teach lists?

Hi Ben,
              Personally steer away from Lists and Dictionaries, even though they're technically easier to use (and in at least the case of dictionaries, sometimes faster) purely because I don't want to add any extra confusion for the students. When it comes to exams, they are likely to be asked questions about arrays. If they put in an example in list format, an exam assessor may not get that and give them zero.... Especially if you look at RemoveAt() and other list shortcuts.
That's just my overly cautious approach, quite possibly I'm underselling the students ability to discriminate the best time to use it.
Cheers
Damien

Damien Atkinson-Buck
Head of Learning Area: Technology/Arts
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From: Baas, Benjamin B [mailto:baas.benjamin.b at edumail.vic.gov.au]
Sent: Monday, 7 March 2016 9:49 AM
To: Year 12 Software Development Teachers' Mailing List
Subject: [Year 12 SofDev] Should I teach lists?

Hi all,

I'm contemplating whether on not I should teach my students about Lists in C# and VB as they will be of more use to them then Arrays when doing their SAT (List are dynamic and have more functionality). I just wanted to know what peoples thoughts are on this and if they go beyond the data collections mentioned in the study design. The SD just mentions Arrays and Records.

Cheers,

Ben.

Benjamin Baas
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